Global Machinery Company Automobile 2500HD User Manual

2007 TRAILERING WITH GMC TRUCKS  
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3
POWERTRAIN SELECTION  
The greater your towing requirements, the greater the demand you place on your vehicle’s powertrain. That’s why  
it is so important to carefully select all your powertrain components in response to your trailering needs. Below  
are some key guidelines.  
ENGINES  
TRANSMISSIONS  
The information presented in the charts in this document is intended to help you  
identify the right engine for your application. The charts show, by vehicle type  
and trailer weight, the minimum engine sizes and available axle ratios needed to  
provide good performance at legal highway speeds with no significant reduction  
in long-term durability.  
Transmissions provide various gear ratios that allow for higher engine rpm  
relative to road speed. They also multiply the engine’s torque to provide the  
pulling power needed to reach cruising speeds. All GMC truck transmissions*  
feature an overdrive top gear that reduces engine speed when cruising, for  
improved fuel efficiency.  
Engine performance is measured in horsepower and torque. Horsepower is a  
measurement of the work an engine can produce and is a factor of both torque  
and engine speed. Torque is a twisting force normally expressed in pounds-feet  
(lb.-ft.). You need torque, to put a twisting force on the drive axles and to turn the  
wheels when you start a load moving. The engine’s torque can be multiplied using  
transmission and drive axle gears. Higher numerical gear ratios increase the  
leverage (twisting force) on a rotating shaft. GMC truck engines are designed with  
a broad rpm range in which high torque can be produced and sustained.  
Some GMC trucks offer a choice of manual or automatic transmission. General  
Motors recommends automatic transmissions for trailering. Automatic transmissions  
utilize a torque converter (a type of fluid coupling) between the engine and  
transmission gears. The torque converter is capable of more than doubling the  
engine’s torque when starting to move a heavy trailer, in addition to acting as  
a cushion to reduce shock loading of powertrain components. The increased  
twisting force from the  
torque converter is  
further multiplied by  
the transmission gears  
to provide outstanding  
load-starting capability —  
and there is no  
conventional clutch  
A larger engine with greater torque and horsepower will provide a performance  
improvement while operating with less strain. For example, higher horsepower  
allows the engine to maintain highway speeds when pulling a heavy trailer uphill.  
Under the following higher performance demands, it is advisable to choose  
an engine larger than the minimum recommendation, if one is available:  
• if much of the towing will be at high altitudes, since a gasoline engine loses  
approximately 10% of its power for every 1000 metres of altitude  
to slip and burn out.  
Caution: The torque  
• if mountainous terrain involving long,  
steep grades will be  
converter’s operation  
causes heat to build  
encountered frequently  
up in the automatic  
transmission’s oil,  
so all GMC automatic  
transmissions have an  
oil cooler. For heavy-duty applications such as trailering, your vehicle should be  
equipped with additional transmission oil cooling if not standard equipment.  
*Except Torrent which uses a 5-speed automatic transmission with a 2.65:1 final drive ratio.  
• if the trailer has a very  
large frontal area,  
which adds to air drag  
and therefore to  
pulling requirements  
REAR AXLE RATIOS  
Another important consideration when determining an ideal trailering vehicle is  
the rear axle ratio. Higher axle ratios (4.10:1, for example) increase engine speed  
relative to road speed, resulting in increased horsepower development and  
torque multiplication. This produces greater towing power, but with a possible  
reduction in fuel efficiency when lightly loaded. Overdrive transmissions help to  
reduce this negative.  
Lower ratios (3.42:1, for example) translate into lower engine rpms, reducing the  
torque at the drive wheels. Some gains may be expected in fuel efficiency when  
lightly loaded and not towing.  
SELECT THE CORRECT AXLE RATIO FOR YOUR REQUIREMENTS  
Lower Numerical Ratio  
(such as 3.42:1)  
REAR AXLE RATIO  
Higher Numerical Ratio  
(such as 4.10:1)  
Lower  
Slower  
Less  
ENGINE SPEED (RPM)  
Higher  
Faster  
More  
ACCELERATION  
FUEL CONSUMPTION  
PERFORMANCE  
(Trailering or mountainous terrain)  
Less  
Greater  
Charts on pages 6 through 15 show the axle ratios required, with available engines, to provide the torque development for good performance with various loads.  
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4
KNOW YOUR WEIGHTS AND HITCHES  
Overloading of tow vehicles and trailers compromises safety and can result in vehicle failure. An understanding of  
the following terms will assist in proper vehicle selection and help prevent overloading.  
DRY TRAILER WEIGHT  
HITCHES  
The weight of the empty trailer as manufactured. This weight, usually shown on  
a vehicle identification plate, is not usually used as a measure for the selection  
of a tow vehicle.  
Once you have selected your vehicle, the next step is making sure you have  
the necessary equipment to help you trailer safely and confidently. The vehicle  
owner is responsible for obtaining the hitch ball, a hitch of the proper size,  
type and capacity, and other appropriate equipment required to safely tow the  
loaded trailer.  
LOADED TRAILER WEIGHT  
The weight of the trailer (Dry Weight) plus all equipment, fluids and cargo.  
Loaded Trailer Weight can be determined by putting the fully loaded vehicle on  
a commercial vehicle scale. If this is not practical, the trailer’s Gross Vehicle  
Weight Rating (GVWR), as found in the trailer manufacturer’s literature or  
brochures for the model selected, can be used when selecting a tow vehicle.  
There are three categories of trailer hitches: weight-carrying, weight-distributing  
and fifth-wheel. Each is designed for specific types of trailering.  
Weight-Carrying Hitch is the most  
basic and most common hitch  
for light and medium weights.  
A weight-carrying hitch uses a  
hitch ball mounted to a draw bar  
or a step-bumper and supports the  
trailer tongue weight just as though  
it were cargo located at the ball.  
The hitch ball must match the trailer  
MAXIMUM TRAILER WEIGHT RATING  
Often referred to as the Gross Trailer Weight Rating, it is the most weight that a  
given vehicle can safely and reliably haul, as determined by the manufacturer.  
This rating usually requires optional equipment such as a specific axle ratio,  
suspension components, engine and/or transmission coolers and type of hitch.  
The rating assumes the tow vehicle is properly equipped with a driver allowance  
of 68 kg (150 lb.) and no cargo. The weight of additional options or equipment,  
passengers and cargo must be deducted from the trailer weight rating.  
coupler and meet or exceed the  
Draw bar type weight-carrying hitch.  
maximum trailer weight rating.  
Weight-Distributing Hitch is used for heavy trailering. This hitch, with its equalizing  
bars and snap-up brackets, applies leverage between the tow vehicle and the  
trailer to help distribute your trailer’s tongue weight evenly to your vehicle  
and trailer instead of “carrying” the load mostly on the rear of the vehicle. The  
brackets and spring bars raise the hitch point parallel to the ground, equalizing  
the load onto all axles. This results in a more level ride, reduced weight on the  
rear suspension and provides improved steering and braking control.  
GROSS VEHICLE WEIGHT RATING (GVWR)  
The maximum allowable weight, as determined by the manufacturer, for any  
vehicle (or trailer) including the weight of the vehicle, fuel and other fluids,  
driver and passengers, cargo and equipment. Tongue Weight or Kingpin Weight  
(see below) is included when trailering.  
CURB WEIGHT  
The weight of the empty vehicle as equipped, including a full tank of fuel. It does  
not include the driver, passengers or cargo — so it is similar to Dry Trailer Weight.  
PAYLOAD WEIGHT  
The weight carried by the vehicle, including the driver, passengers and cargo,  
plus options or aftermarket equipment such as boxliners, hitches or fifth wheels.  
It should not exceed the Gross Vehicle Weight Rating (GVWR) minus the Curb Weight.  
GROSS AXLE WEIGHT RATING (GAWR)  
The maximum allowable weight that can be carried on a vehicle’s axle or individual  
suspension system, either front or rear. It includes the weight of the vehicle  
plus cargo and equipment supported by the axle and includes Tongue Weight  
or Kingpin Weight when trailering. These ratings are shown on the vehicle’s  
Certification Label, usually located in the driver’s door frame, and should not  
be exceeded, nor should the total load exceed the GVWR.  
Weight-distributing hitch.  
Fifth-Wheel Hitch, or gooseneck hitch, is used for heavy trailering with a full-size  
pickup, and it must be attached to the truck’s frame, usually just slightly ahead  
of the rear axle centreline. Make sure to follow the manufacturer’s installation  
instructions, paying careful attention to the truck’s payload capacity and rear  
axle weight ratings. These kingpin loads are generally higher than conventional  
trailer tongue loads and for most calculations becomes the payload in the truck  
box. The addition of kingpin weight must not cause the vehicle to exceed its  
GVWR or GAWRs.  
TONGUE WEIGHT/KINGPIN WEIGHT  
The weight of the trailer tongue or kingpin that is carried on the hitch ball or  
fifth-wheel hitch, respectively. This is a critical measurement as it has an impact  
on vehicle handling. Too much Tongue/Kingpin Weight causes overloading of the  
rear axle, causing the front suspension to lift and reducing steering response.  
Too little Tongue/Kingpin Weight can reduce rear-wheel traction and cause  
excessive swaying or jackknifing. Depending on the type of hitch being used,  
Tongue Weight is generally 10-15% of the Loaded Trailer Weight. Kingpin Weight  
is usualy 15-25% of the trailer weight. Some adjustment to Tongue Weight or  
Kingpin Weight can be made by moving the cargo in the trailer.  
GROSS COMBINATION WEIGHT RATING (GCWR)  
The maximum weight allowable, as established by the manufacturer, for the truck,  
the trailer, all equipment, total payload, fuel, fluids and occupants. This is the  
total loaded road-ready rig.  
Fifth-wheel hitch.  
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5
NOTES AND CONDITIONS  
TRAILER LOADING  
Maximum trailer ratings are calculated based on a properly equipped tow vehicle  
with a driver as its only occupant. The weight of additional equipment, passengers  
or cargo will reduce the trailer rating. In addition to the weight of the trailer,  
maximum trailer weight includes the weight of passengers, equipment and  
cargo in the tow vehicle, plus any cargo on the trailer. The addition of the  
trailer’s tongue weight (or fifth-wheel kingpin weight) must not cause the vehicle  
weights to exceed the Rear Gross Axle Weight Rating (RGAWR) or Gross Vehicle  
Weight Rating (GVWR). The tongue load of any trailer is an important weight to  
measure because it affects the total or gross vehicle weight of your vehicle as well  
as the front and rear axle loads.  
If a weight-carrying or a weight-distributing hitch is used, the trailer tongue  
weight should be 10-15% of the total loaded trailer weight. The kingpin weight of  
fifth-wheel trailers is typically 15-25% of the loaded trailer weight. After you’ve  
loaded your trailer, weigh the trailer and then the tongue separately on a commercial  
scale to see if the weights are accurate. If they are not, some adjustment can be  
made by moving some cargo fore or aft in the trailer. Do not exceed the maximum  
allowable tongue weight for your vehicle. The weight of additional equipment,  
passengers or cargo in the tow vehicle will reduce the allowable tongue weight.  
Refer to the Owner’s Manual for additional information. A Certification/Tire label  
can be found on the rear edge of the vehicle’s driver-side door. The label shows  
the size of the original tires and the inflation pressures needed to obtain the gross  
weight capacity of the vehicle. The GVWR (Gross Vehicle Weight Rating) and both  
front and rear GAWRs (Gross Axle Weight Ratings) are also indicated. Never exceed  
the GVWR, or the GAWR for either the front or rear axle.  
TRAILER BRAKES  
The towing vehicle’s brake system is rated for safe operation at the GVWR and  
not the GCWR.  
2. Hydraulic actuation brakes tap into the tow vehicle’s own brake system and  
are not recommended. Although brake modulation is very good, this method is  
restricted to large tow vehicles with high volume master cylinders and strongly  
assisted power brakes. Care must be taken to follow proper installation procedures  
or complete loss of braking may result. The trailer’s brake parts must be able  
to withstand 3000 pounds per square inch of pressure and not use more than  
0.02 cubic inches of fluid from the tow vehicle’s master cylinder.  
If the loaded trailer will weigh more than 450 kg (1000 lb.), it must have its own  
separate brakes when towing with a compact or mid-size truck, or a Savana Van.  
The GM full-size pickups, sport-utilities and chassis cabs can haul trailers weighing  
up to 907 kg (2000 lb.) without a separate trailer brake system, where local  
regulations permit. Trailer brakes come in three main types:  
3. Surge brakes actuate hydraulic trailer brakes via a master cylinder mounted  
in the trailer coupler. As the vehicle slows, the trailer presses (or surges) against  
the hitch, operating the master cylinder and applying the brakes. Surge brakes  
are ideal for marine trailers where the wheels may be submerged. Surge brakes  
present problems when backing up, as they will lock on unless some manually  
actuated override is provided.  
1. Electric actuation brakes typically utilize the tow vehicle’s battery power and  
the brake light circuit to trigger their function. They provide both automatic and  
manual control of electric trailer brakes. Recent versions have attempted to use  
a sensor in the tow vehicle’s hydraulic system in order to vary trailer brake  
pressure in concert with the driver’s input. The GM full-size pickups and sport-  
utility vehicles with the available Z82 Trailering Special Equipment Package  
provide an under-dash provision for an Electronic Brake Controller (EBC) jumper  
harness. This special wiring harness, with 4 blunt cut wires, is included with the  
Trailering Package. It allows the EBC to electronically adjust brake pressure  
to the trailer brakes.  
NOTE: Be sure to read and follow the instructions for the trailer brake controller  
so that it is installed, adjusted and maintained properly. Many jurisdictions  
require a “breakaway” device which activates the trailer brakes automatically in  
the event the trailer becomes detached.  
TRAILERING AND THE LAW  
Trailering laws vary from place to place. A set-up that’s legal in one province may  
not be legal in another, or in an American state. In some locations, you may be  
required to have a commercial driver’s licence. It pays to check ahead when  
planning a trip to ensure your trailering rig meets the local requirements in all  
provinces and/or states you will be visiting.  
BE SURE AND READ THE TRAILERING INFORMATION FOUND IN YOUR VEHICLE  
OWNER’S MANUAL.  
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6
THE ALL-NEW SIERRA 1500 PICKUPS  
BALL HITCH TRAILERING WITH THE ALL-NEW SIERRA 1500 PICKUPS  
ENGINE  
Vortec 4.3L V6 (LU3)  
Vortec 4.8L V8 (LY2)  
Vortec 5.3L V8 (LY5/LMG/LH6/LC9)  
Vortec 6.0L V8 (L76)  
Horsepower  
Torque (lb.-ft.)  
195 @ 4600  
260 @ 2800  
295 @ 5600  
305 @ 4800  
315 @ 5200  
338 @ 4400  
367 @ 5500  
375 @ 4300  
MODEL  
Max. Trailer  
Weight kg (lb.)  
Axle Ratio  
Required  
Max. Trailer  
Weight kg (lb.)  
Axle Ratio  
Required  
Max. Trailer  
Weight kg (lb.)  
Axle Ratio  
Required  
Max. Trailer  
Weight kg (lb.)  
Axle Ratio  
Required  
C10703 - Regular Cab  
6' 6" Standard Box, 2WD  
2177 (4800)  
2404 (5300)  
3.23  
3.73  
2359 (5200)  
3266 (7200)  
3.23  
3.73  
3266 (7200)  
3720 (8200)  
3.42  
3.73  
C10903 - Regular Cab  
8' Long Box, 2WD  
2132 (4700)  
2359 (5200)  
3.23  
3.73  
2268 (5000)  
3175 (7000)  
3.23  
3.73  
3175 (7000)  
3629 (8000)  
3.42  
3.73  
C10553 - Extended Cab  
5' 8" Short Box, 2WD  
1996 (4400)  
2223 (4300)  
1950 (4300)  
2177 (4800)  
3.23  
3.73  
3.23  
3.73  
2177 (4800)  
3084 (6800)  
2132 (4700)  
3039 (6700)  
3.23  
3.73  
3.23  
3.73  
3084 (6800)  
3538 (7800)  
3039 (6700)  
3493 (7700)  
3.42  
3.73  
3.42  
3.73  
4037 (8900)  
3992 (8800)  
4672 (10,300)  
3.73  
3.73  
3.73  
C10753 - Extended Cab  
6' 6" Standard Box, 2WD  
C10753 Extended Cab  
6' 6" Standard Box, 2WD - NHT*  
C10953 - Extended Cab  
2448 (6500)  
3402 (7500)  
3.42  
3.73  
8
'
Long Box, 2WD  
C10543 - Crew Cab  
5' 8" Short Box, 2WD  
2087 (4600)  
2994 (6600)  
3.23  
3.73  
2994 (6600)  
3417 (7600)  
3.42  
3.73  
3946 (8700)  
3.73  
3.73  
C10543 - Crew Cab  
5' 8" Short Box, 2WD - NHT*  
4627 (10,200)  
K10703 - Regular Cab  
6' 6" Standard Box, 4x4  
2313 (5100)  
2177 (4800)  
3.73  
3.73  
2676 (5900)  
3583 (7900)  
2676 (5900)  
3583 (7900)  
3.42  
4.10  
3.42  
4.10  
3583 (7900)  
4037 (8900)  
3583 (7900)  
4037 (8900)  
3.73  
4.10  
3.73  
4.10  
K10903 - Regular Cab  
8' Long Box, 4x4  
K10553 - Extended Cab  
5' 8" Short Box, 4x4  
2595 (5500)  
3402 (7500)  
2495 (5500)  
3402 (7500)  
3.42  
4.10  
3.42  
4.10  
3402 (7500)  
3856 (8500)  
3402 (7500)  
3856 (8500)  
3.73  
4.10  
3.73  
4.10  
3900 (8600)  
3856 (8500)  
4763 (10,500)  
3.73  
3.73  
4.10  
K10753 - Extended Cab  
6' 6" Standard Box, 4x4  
K10753 Extended Cab  
6' 6" Standard Box, 4x4 - NHT*  
K10953 - Extended Cab  
3311 (7300)  
3765 (8300)  
3.73  
4.10  
8
'
Long Box, 4x4  
K10543 - Crew Cab  
5' 8" Short Box, 4x4  
2449 (5400)  
3357 (7400)  
3.42  
4.10  
3402 (7500)  
3856 (8500)  
3.73  
4.10  
3856 (8500)  
3.73  
4.10  
K10543 - Crew Cab  
5' 8" Short Box, 4x4 - NHT*  
4763 (10,500)  
FIFTH -WHEEL TRAILERING WITH THE ALL-NEW SIERRA 1500 PICKUPS  
ENGINE/TRANSMISSION  
Vortec 4.8L V8 (LY2)  
Vortec 5.3L V8 (ALL)  
Vortec 6.0L V8 (L76)  
MODEL  
Max. Trailer  
Weight, kg (lb.)  
Axle Ratio  
Required  
Max. Trailer  
Weight, kg (lb.)  
Axle Ratio  
Required  
Max. Trailer  
Weight, kg (lb.)  
Axle Ratio  
Required  
C10703 Regular Cab  
6' 6" Standard Box, 2WD  
3266 (7200)  
3.73  
3.73  
3.73  
3266 (7200)  
3720 (8200)  
3175 (7000)  
3629 (8000)  
3039 (6700)  
3493 (7700)  
3.42  
3.73  
3.42  
3.73  
3.42  
3.73  
C10903 Regular Cab  
8' Long Box, 2WD  
3175 (7000)  
3039 (6700)  
C10753 Extended Cab  
6' 6" Standard Box, 2WD  
3992 (8800)  
3.73  
3.73  
C10753 Extended Cab  
6' 6" Standard Box, 2WD - NHT*  
4672 (10,300)  
C10953 Extended Cab  
8' Long Box, 2WD  
2948 (6500)  
3402 (7500)  
3.42  
3.73  
K10703 Regular Cab  
6' 6" Standard Box, 4x4  
3311 (7300)  
3765 (8300)  
3583 (7900)  
4037 (8900)  
3402 (7500)  
3856 (8500)  
3.73  
4.10  
3.73  
4.10  
3.73  
4.10  
3311 (7300)  
3583 (7900)  
3402 (7500)  
4.10  
4.10  
4.10  
K10903 Regular Cab  
8' Long Box, 4x4  
K10753 Extended Cab  
6' 6" Standard Box, 4x4  
3900 (8600)  
3.73  
4.10  
K10753 Extended Cab  
6' 6" Standard Box, 4x4 - NHT*  
4763 (10,500)  
K10953 Extended Cab  
8' Long Box, 4x4  
3266 (7200)  
3720 (8200)  
3.73  
4.10  
*With optional VortecMAX Performance Package (NHT). Notes: Please refer to the cautions and restrictions shown in the notes in the Sierra 1500 section on page 8.  
GROSS COMBINATION WEIGHT RATING (GCWR) – 1500 SERIES  
GCWR kg (lb.)  
4309 (9500)  
4536 (10,000)  
4990 (11,000)  
5443 (12,000)  
5897 (13,000)  
6350 (14,000)  
7031 (15,500)  
7258 (16,000)  
ENGINE  
AXLE RATIO WITH AUTOMATIC TRANSMISSION  
Vortec 4.3L V6 (LU3)  
Vortec 4.8L V8 (LY2)  
Vortec 5.3L V8 (ALL)  
Vortec 6.0L V8 (L76)  
3.23  
3.73  
3.23  
3.42  
3.73  
3.42  
4.10  
3.73  
4.10  
3.731  
3.732  
4.103  
1Not available with VortecMAX Performance Package (NHT). 22WD models with VortecMAX Performance Package (NHT). 34x4 models with VortecMAX Performance Package (NHT).  
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7
TRAILERING WITH THE ALL-NEW SIERRA 2500HD AND 3500HD PICKUPS  
BALL HITCH TRAILERING  
FIFTH-WHEEL TRAILERING  
ENGINE/TRANSMISSION  
Vortec 6.0L V8 (LY6)  
Automatic 6-speed (MYD)  
Duramax 6.6L V8 Diesel (LMM)  
Automatic 6-speed (MW7)  
Vortec 6.0L V8 (LY6)  
Automatic 6-speed (MYD)  
Duramax 6.6L V8 Diesel (LMM)  
Automatic 6-speed (MW7)  
Horsepower  
Torque (lb.-ft.)  
353 @ 5400  
373 @ 4400  
365 @ 3200  
660 @ 1600  
353 @ 5400  
373 @ 4400  
365 @ 3200  
660 @ 1600  
MODEL  
Max. Trailer  
Weight kg (lb.)  
Max. Trailer  
Weight kg (lb.)  
Max. Trailer  
Weight kg (lb.)  
Max. Trailer  
Weight kg (lb.)  
2500HD - 4173 kg (9200 lb.) GVWR  
C20903 - Regular Cab  
Long Box, 2WD  
C20753 - Extended Cab  
Standard Box, 2WD  
C20953 - Extended Cab  
Long Box, 2WD  
C20743 - Crew Cab  
Standard Box, 2WD  
C20943 - Crew Cab  
Long Box, 2WD  
K20903 - Regular Cab  
Long Box, 4x4  
K20753 - Extended Cab  
Standard Box, 4x4  
K20953 - Extended Cab  
Long Box, 4x4  
5851 (12,900)  
5761 (12,700)  
4670 (12,500)  
4670 (12,500)  
5625 (12,400)  
5761 (12,700)  
5625 (12,400)  
5534 (12,200)  
5579 (12,300)  
5489 (12,100)  
5897 (13,000)  
5897 (13,000)  
5897 (13,000)  
5897 (13,000)  
5897 (13,000)  
5897 (13,000)  
5897 (13,000)  
5897 (13,000)  
5897 (13,000)  
5897 (13,000)  
5851 (12,900)  
5761 (12,700)  
4670 (12,500)  
4670 (12,500)  
5625 (12,400)  
5761 (12,700)  
5625 (12,400)  
5534 (12,200)  
5579 (12,300)  
5489 (12,100)  
7167 (15,800)  
6985 (15,400)  
6804 (15,000)  
6895 (15,200)  
6532 (14,400)  
7031 (15,500)  
6486 (14,300)  
6078 (13,400)  
6169 (13,600)  
5670 (12,500)  
K20743 - Crew Cab  
Standard Box, 4x4  
K20943 - Crew Cab  
Long Box, 4x4  
3500HD - 4491 kg (9900 lb.) GVWR with Single Rear Wheels.  
C30953 - Extended Cab  
Long Box, 2WD  
5534 (12,200)  
5489 (12,100)  
5625 (12,400)  
5443 (12,000)  
5352 (11,800)  
5897 (13,000)  
5897 (13,000)  
5897 (13,000)  
5897 (13,000)  
5897 (13,000)  
5534 (12,200)  
5489 (12,100)  
5625 (12,400)  
5443 (12,000)  
5352 (11,800)  
6849 (15,100)  
7439 (16,400)  
6940 (15,300)  
6759 (14,900)  
6623 (14,600)  
C30943 - Crew Cab  
Long Box, 2WD  
K30903 - Regular Cab  
Long Box, 4x4  
K30953 - Extended Cab  
Long Box, 4x4  
K30943 - Crew Cab  
Long Box, 4x4  
3500HD - 4171 kg (11,400 lb.) GVWR with Dual Rear Wheels.  
C30953 - Extended Cab  
Long Box, 2WD  
5443 (12,000)  
5352 (11,800)  
5534 (12,200)  
5307 (11,700)  
5262 (11,600)  
5897 (13,000)  
5897 (13,000)  
5897 (13,000)  
5897 (13,000)  
5897 (13,000)  
5443 (12,000)  
5352 (11,800)  
5534 (12,200)  
5307 (11,700)  
5262 (11,600)  
7394 (16,300)  
7348 (16,200)  
7484 (16,500)  
7358 (16,000)  
7212 (15,900)  
C30943 - Crew Cab  
Long Box, 2WD  
K30903 - Regular Cab  
Long Box, 4x4  
K30953 - Extended Cab  
Long Box, 4x4  
K30943 - Crew Cab  
Long Box, 4x4  
NOTES:  
• Fifth-wheel kingpin loads are higher than ball hitch trailer tongue loads, so careful attention  
must be given to the truck’s payload capacity and rear axle weight ratings (GAWR).  
Subtract the tow vehicle’s weight plus passenger and cargo weights from the GVWR to  
determine the available payload and/or kingpin weight allowance.  
• Trailering kingpin weight should be 15-25% of loaded trailer weight.  
• Trailering capacity may be limited by the tow vehicle’s ability to carry the kingpin weight  
without exceeding the GVWR or rear GAWR.  
• The Integrated Trailer Brake Control (option JL1) is new for 2007 in combination with the  
Trailering Special Equipment Package (option Z82). This facilitates hook-up of electric  
trailer brakes and provides excellent brake modulation.  
• The maximum allowable Gross Combination Weight Ratings (GCWR) are;  
- 8392 kg (18,500 lb.) with the Vortec 6.0L V8 (LY6)  
- 9979 kg (22,000 lb.) with the Duramax 6.6L V8 Diesel with Single Rear Wheels (SRW).  
- 10,600 kg (23,500 lb.) with the Duramax 6.6L V8 Diesel with Dual Rear Wheels (DRW).  
- All 2500HD and 3500HD Series have an automatic transmission and a 3.73 axle ratio as  
standard equipment.  
- Use this GCWR information when calculating the trailering capacity for Chassis Cabs/Box  
Delete (option ZW9) models. The GCWR includes the total loaded weight of the truck, the  
body and the trailer.  
• The 2500HD and 3500HD models have a weight-carrying hitch limit of 3402 kg (7500 lb.)  
and require a weight-distributing hitch with trailer weights in excess of this limit.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
8
SIERRA 1500 & 1500HD PICKUPS  
BALL HITCH TRAILERING WITH SIERRA 1500 AND 1500HD — AUTOMATIC TRANSMISSION  
ENGINE  
Vortec 4.3L V6 (LU3)  
Vortec 4.8L V8 (LR4)  
Vortec 5.3L V8 (LM7/L59)  
Vortec 6.0L V8 (LQ4/LQ9)  
Horsepower  
Torque (lb.-ft.)  
195 @ 4000  
260 @ 2800  
285 @ 5200  
295 @ 4000  
295 @ 5200  
335 @ 4000  
LQ4 - 300 @ 4400  
360 @ 4000  
LQ9 - 345 @ 5200  
380 @ 4000  
MODEL  
Max. Trailer  
Weight kg (lb.)  
Axle Ratio  
Required  
Max. Trailer  
Weight kg (lb.)  
Axle Ratio  
Required  
Max. Trailer  
Weight kg (lb.)  
Axle Ratio  
Required  
Max. Trailer  
Weight kg (lb.)  
Axle Ratio  
Required  
C15703 - Regular Cab  
6' 6" Standard Box, 2WD  
2268 (5000)  
3.23  
2903 (6400)  
3357 (7400)  
3.23  
3.73  
3357 (7400)  
3810 (8400)  
3.23  
3.73  
C15903 - Regular Cab  
8' Long Box, 2WD  
2177 (4800)  
3.23  
2812 (6200)  
3266 (7200)  
3.23  
3.73  
3266 (7200)  
3720 (8200)  
3.23  
3.73  
C15553 - Extended Cab  
5' 8" Short Box, 2WD  
3175 (7000)  
3629 (8000)  
3.23  
3.73  
C15753 - Extended Cab  
6' 6" Standard Box, 2WD  
2087 (4600)  
2313 (5100)  
3.23  
3.73  
2676 (5900)  
3130 (6900)  
3.23  
3.73  
3130 (6900)  
3583 (7900)  
3.23  
3.73  
3538 (7800)  
4717 (10,400)*  
3.23  
4.10  
C15753 - Extended Cab 6' 6"  
Standard Box, 2WD-Hybrid  
3039 (6700)  
3493 (7700)  
3.23  
3.73  
C15953 - Extended Cab  
8' Long Box, 2WD  
2631 (5800)  
3084 (6800)  
3.23  
3.73  
3084 (6800)  
3538 (7800)  
3.23  
3.73  
C15543 - Crew Cab  
5' 8" Short Box, 2WD  
2586 (5700)  
3.23  
3039 (6700)  
3493 (7700)  
3.23  
3.73  
4581 (10,000)*  
3.73  
C15743HD - Crew Cab  
6' 6" Standard Box, 2WD  
3765 (8300)  
4672 (10,300)  
3.73  
4.10  
K15703 - Regular Cab  
6' 6" Standard Box, 4x4  
2313 (5100)  
2268 (5000)  
3.73  
3.73  
3221 (7100)  
3221 (7100)  
3674 (8100)  
3130 (6900)  
3130 (6900)  
3583 (7900)  
3.42  
3.73  
4.10  
3.42  
3.73  
4.10  
3674 (8100)  
3674 (8100)  
4128 (9100)  
3583 (7900)  
3583 (7900)  
4037 (8900)  
3.42  
3.73  
4.10  
3.42  
3.73  
4.10  
K15903 - Regular Cab  
8' Long Box, 4x4  
K15553 - Extended Cab  
5' 8" Short Box, 4x4  
3493 (7700)  
3493 (7700)  
3946 (8700)  
3.42  
3.73  
4.10  
K15753 - Extended Cab  
6' 6" Standard Box, 4x4  
3039 (6700)  
3039 (6700)  
3493 (7700)  
3.42  
3.73  
4.10  
3493 (7700)  
3493 (7700)  
3946 (8700)  
3.42**  
3.73**  
4.10**  
4536 (10,000)*  
4.10  
K15753 - Extended Cab 6' 6"  
Standard Box, 4x4 - Hybrid  
3357 (7400)  
3357 (7400)  
3.42  
3.73  
K15953 - Extended Cab  
8' Long Box, 4x4  
2948 (6500)  
2948 (6500)  
3402 (7500)  
3.42  
3.73  
4.10  
3402 (7500)  
3402 (7500)  
3856 (8500)  
3.42  
3.73  
4.10  
K15543 - Crew Cab  
5' 8" Short Box, 4x4  
2903 (6400)  
3.73  
3357 (7400)  
3357 (7400)  
3810 (8400)  
3.42  
3.73  
4.10  
4491 (9900)*  
3674 (8100)  
4.10  
4.10  
K15543 - Crew Cab Denali  
5' 8" Short Box, AWD  
K15743HD - Crew Cab  
6' 6" Standard Box, 4x4  
3583 (7900)  
4491 (9900)  
3.73  
4.10  
*With optional VortecMAX Performance Package (NHT). **Vortec 5.3L V8 develops 310 horsepower in this application (L33 with aluminum block).  
• Trailer 5th-wheel kingpin weight should be 15-25% of the total loaded trailer weight (up to  
680 kg (1500 lb.) on 1500 models – 1134 kg (2500 lb.) on 1500HD models). Fifth-wheel  
trailers have a greater percentage of their weight on the kingpin (tongue load) than a  
conventional trailer. Because of this, greater attention must be given to the maximum  
allowable payload and GVWR.  
NOTES:  
• Any Sierra pickup can tow a 907 kg (2000 lb.) trailer without special equipment.  
• Weight-Carrying Hitch Limit: 2268 kg (5000 lb.) trailer with 272 kg (600 lb.) tongue weight.  
• A Weight-Distributing Hitch and Sway Control is required over 2268 kg (5000 lb.) Trailer Weight.  
• Sierra 1500 models are limited to 2268 kg (5000 lb.) trailer rating unless equipped with  
Heavy-Duty (Z85), High Performance (Z60), Ride Control (ZX3) or Off-road Suspension  
Package (Z71).  
• 1500 Short Box models are neither designed or intended to tow 5th-wheel or  
gooseneck trailers.  
• Ball hitch trailers over 2268 kg (5000 lb.) require optional Trailering Special Equipment  
(Z82), which includes a weight-distributing hitch platform, extra capacity transmission  
cooling, if not already equipped, a high capacity air cleaner, an electric brake control wiring  
harness and a heavy-duty 8-lead wiring harness with a 7-pin connector.  
• Trailer tongue weight should be 10-15% of the total loaded trailer weight (up to 454 kg (1000 lb.)  
on 1500 models – 543 kg (1200 lb.) on models with option NHT, VortecMAX Performance  
Package – 680 kg (1500 lb.) on 1500HD models).  
Caution must be used when selecting a Sierra 1500 model to tow fifth-wheel  
trailers due to limited payload and rear axle capacity to handle typical kingpin  
weights. Payload capacity is reduced by the added weight of additional optional  
equipment plus passengers and cargo in the tow vehicle. Sierra 1500 models can  
tow 5th-wheel trailers, within the limits shown on page 9, as long as the kingpin  
weight does not cause the vehicle to exceed the GVWR or GAWRs.  
• Addition of trailer tongue or kingpin weight must not cause the vehicle weights to exceed the  
Rear Gross Axle Weight Rating (RGAWR) or Gross Vehicle Weight Rating (GVWR).  
GROSS COMBINATION WEIGHT RATINGS (GCWR) – 1500 AND 1500HD SERIES  
GCWR kg  
(lb.)  
3856  
(8500)  
4082  
(9000)  
4309  
(9500)  
4536  
(10,000)  
4990  
(11,000)  
5443  
(12,000)  
5897  
(13,000)  
6350  
(14,000)  
7031  
(15,500)  
7258  
(16,000)  
ENGINE  
AXLE RATIO WITH AUTOMATIC TRANSMISSION  
3.23 3.73  
Vortec 4.3L V6 (LU3)  
Vortec 4.8L V8 (LR4)  
Vortec 5.3L V8 (ALL)  
Vortec 6.0L V8 (LQ9)  
Vortec 6.0L V8 (LQ4)  
ENGINE  
3.23  
3.42/3.73  
3.23  
4.10  
3.42/3.73  
3.73  
4.10  
3.73  
3.73/4.10*  
4.10  
AXLE RATIO WITH MANUAL TRANSMISSION  
Vortec 4.3L V6 (LU3)  
3.23  
3.73  
*7031 kg (15,500 lb.) on models with option NHT, VorteDcMowAXnPloerafodrmfaroncme PWackwagwe..Somanuals.com. All Manuals Search And Download.  
9
GMC recommends that you specify a 4-speed automatic transmission with overdrive for your 1500 Series Sierra if  
you plan to tow with it. Trailer ratings for vehicles equipped with a manual transmission are generally reduced as  
shown below and on the GCWR chart on page 8. Note that the Vortec 4.3L V6 is the only engine currently available  
with a manual transmission.  
BALL HITCH TRAILERING WITH SIERRA 1500  
PICKUPS — MANUAL TRANSMISSION  
A 1500 Extended Cab with the available VortecMAX Performance  
Package makes an ideal family tow vehicle. With a GVWR of up to  
2903 kg (6400 lb.), a towing capacity of 4717 kg (10,400 lb.) on  
2WD models and a 345-hp VortecMAX V8 engine, it can handle  
most trailering duties with ease. Refer to the information on  
page 8 for details.  
ENGINE  
MODEL  
VORTEC 4.3L V6  
Max. Trailer  
Weight, kg (lb.)  
Axle Ratio  
Required  
C15703 Regular Cab  
Standard Box, 2WD  
1814 (4000)  
1724 (3800)  
1860 (4100)  
1814 (4000)  
3.23  
3.23  
3.73  
3.73  
C15903 Regular Cab  
Long Box, 2WD  
K15703 Regular Cab  
Standard Box, 4x4  
K15903 Regular Cab  
Long Box, 4x4  
SIERRA TRAILER-TOWING FEATURES:  
• Automatic transmissions feature a Tow/Haul mode for improved  
performance when towing.  
FIFTH-WHEEL TRAILERING WITH SIERRA 1500 AND 1500HD PICKUPS —  
AUTOMATIC TRANSMISSION  
ENGINE/TRANSMISSION  
VORTEC 4.8L V8  
VORTEC 5.3L V8  
VORTEC 6.0L V8  
• Four-wheel anti-lock braking system (ABS) with  
Dynamic Rear Proportioning (DRP) adds a measure of safety  
when braking, especially on slippery surfaces.  
MODEL  
Max. Trailer Axle Ratio Max. Trailer Axle Ratio Max. Trailer Axle Ratio  
Weight, kg (lb.) Required Weight, kg (lb.) Required Weight, kg (lb.) Required  
C15703 Regular Cab  
Standard Box, 2WD  
2903 (6400)  
3357 (7400)  
3.23  
3.73  
3357 (7400)  
3810 (8400)  
3.23  
3.73  
• Rear axles use a synthetic lubricant for lower operating  
temperatures under heavy-load conditions.  
C15903 Regular Cab  
Long Box, 2WD  
2812 (6200)  
3266 (7200)  
3.23  
3.73  
3266 (7200)  
3720 (8200)  
3.23  
3.73  
• Large, cross-flow radiators with excellent airflow  
characteristics keep things cool in extreme conditions.  
C15753 Extended Cab  
Standard Box, 2WD  
2676 (5900)  
3084 (6800)  
3.23  
3.73  
3084 (6800)  
3084 (6800)  
3.23  
3.73  
3130 (6900)*  
4.10  
• The Driver Information Centre (DIC) monitors both engine and  
transmission temperatures and alerts the operator of any  
problems before damage occurs. A dedicated transmission fluid  
temperature gauge is available on 2500HD and 3500 models  
that are equipped with an automatic transmission.  
C15953 Extended Cab  
Long Box, 2WD  
2631 (5800)  
3084 (6800)  
3.23  
3.73  
3084 (6800)  
3447 (7600)  
3.23  
3.73  
C15743HD Crew Cab  
Standard Box, 2WD  
3765 (8300)  
4672 (10,300)  
3.73  
4.10  
K15703 Regular Cab  
Standard Box, 4x4  
3220 (7100) 3.42/3.73 3311 (7300) 3.42/3.73  
3311 (7300) 4.10 3311 (7300) 4.10  
3130 (6900) 3.42/3.73 3583 (7900) 3.42/3.73  
3583 (7900) 4.10 3765 (8300) 4.10  
3039 (6700) 3.42/3.73 3131 (6900) 3.42/3.73  
3130 (6900) 4.10 3131 (6900) 4.10  
• Three-piece modular frame with a hydroformed front section  
provides exceptional strength without unnecessary weight.  
K15903 Regular Cab  
Long Box, 4x4  
• Independent front suspension is used on all pickup models,  
both two- and four-wheel drive, providing superior ride and  
handling. Suspension packages are available for trailering.  
K15753 Extended Cab  
Standard Box, 4x4  
K15743HD Crew Cab  
Standard Box, 4x4  
3583 (7900)  
4491 (9900)  
3.73  
4.10  
• The Trailering Special Equipment Package includes a weight-  
distributing hitch receiver, an electric brake control wiring  
harness, as well as a trailer wiring 7-pin connector. Engine and  
transmission coolers are included as required.  
*With optional VortecMAX Performance Package (NHT).  
VORTECMAX PERFORMANCE PACKAGE  
The VortecMAX Performance Package, (option NHT), adds an extra measure  
of capability and toughness to selected 1500 series pickups. This Performance  
Package provides a trailer rating of up to 4763 kg (10,500 lb.) with the all-new  
Sierra 4x4 Extended and Crew Cab models. It’s available on 1500 2WD and 4x4  
Extended Cab standard box and Crew Cab short box models and includes the  
following equipment;  
• Heavy-duty rear axle assembly with a 9.5 in. diameter ring gear similar to the  
2500 models  
• P265/70R17 On/Off Road tires including the spare  
• Locking differential for superior traction  
• Autotrac four-wheel drive system on 4x4 models  
• Trailering Special Equipment that includes a weight-distributing platform trailer  
hitch receiver, a heavy-duty 8-lead wiring harness with a 7-way sealed connector  
and trailer brake control wiring harness plus extra capacity cooling and high-  
capacity air cleaner  
• Vortec 6.0L V8 engine that develops 345 hp and 380 lb.-ft. of torque and on the  
all-new Sierra develops 367 hp and 375 lb.-ft. of torque  
• Engine oil cooling system for extended engine life in severe service applications  
• 4-speed super-duty automatic transmission (model 4L70E) with Tow/Haul mode  
and an oil temperature sensor that will signal the DIC to display a “TRANSMISSION  
HOT” message and also cause the transmission to enter a protection mode until  
it cools down  
• Special identification on the doors and a Vortec engine cover label.  
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10  
SIERRA 2500HD & 3500 PICKUPS WITH BALL HITCH  
The bigger the job, the more you’ll appreciate the capabilities of these Sierra heavy-duty pickups. The 2500HD and  
3500 pickups deliver all the power you need with the available 330-hp Vortec 8.1L V8 and turbocharged 360-hp  
Duramax 6.6L Diesel V8 engines. Coupled with the Allison 1000 Series 6-speed automatic transmission, these  
powertrains offer the performance needed for even the most demanding trailering applications.  
BALL HITCH TRAILERING SIERRA 2500HD AND 3500 PICKUPS  
ENGINE/TRANSMISSION  
Vortec 6.0L V8 (LQ4)  
Manual or Automatic  
Vortec 8.1L V8 (L18)  
Automatic 6-speed  
Duramax 6.6L V8 Diesel (LBZ)  
Automatic 6-speed  
Horsepower  
Torque (lb.-ft.)  
300 @ 4400  
360 @ 4000  
330 @ 4200  
450 @ 3200  
360 @ 3200  
650 @ 1600  
MODEL  
Max. Trailer  
Weight, kg (lb.)  
Axle Ratio  
Required  
Max. Trailer  
Weight, kg (lb.)  
Axle Ratio  
Required  
Max. Trailer  
Weight, kg (lb.)  
Axle Ratio  
Required  
2500HD - 4173 kg (9200 lb.) GVWR  
C25903 – Regular Cab  
Long Box, 2WD  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
3.73  
4.10  
3.73  
4.10  
3.73  
4.10  
3.73  
4.10  
3.73  
4.10  
3.73  
4.10  
3.73  
4.10  
3.73  
4.10  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
3.73  
3.73  
3.73  
3.73  
3.73  
3.73  
3.73  
3.73  
3.73  
3.73  
4763 (10,500)  
4672 (10,300)  
4627 (10,200)  
4581 (10,100)  
4536 (10,000)  
4672 (10,300)  
4536 (10,000)  
4491 (9900)  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
C25753 – Extended Cab  
Standard Box, 2WD  
C25953 – Extended Cab  
Long Box, 2WD  
C25743 – Crew Cab  
Standard Box, 2WD  
C25943 – Crew Cab  
Long Box, 2WD  
K25903 – Regular Cab  
Long Box, 4x4  
K25753 – Extended Cab  
Standard Box, 4x4  
K25953 – Extended Cab  
Long Box, 4x4  
K25743 – Crew Cab  
Standard Box, 4x4  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
3.73  
4.10  
3.73  
4.10  
4445 (9800)  
K25943 – Crew Cab  
Long Box, 4x4  
4400 (9700)  
3500 - 4491 kg (9900 lb.) GVWR with Single Rear Wheels (SRW) / 4171 kg (11,400 lb.) GVWR with Dual Rear Wheels (DRW)  
C35953 – Extended Cab  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
3.73  
3.73  
3.73  
3.73  
3.73  
3.73  
3.73  
3.73  
3.73  
3.73  
Long Box, 2WD/SRW  
4445 (9800)  
4400 (9700)  
4355 (9600)  
4305 (9500)  
4536 (10,000)  
4445 (9800)  
4355 (9600)  
4264 (9400)  
4264 (9400)  
4173 (9200)  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
5443 (12,000)  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
C35953 – Extended Cab  
Long Box, 2WD/DRW  
C35943 – Crew Cab  
Long Box, 2WD/SRW  
C35943 – Crew Cab  
Long Box, 2WD/DRW  
K35903 – Regular Cab  
Long Box, 4x4/SRW  
K35903 – Regular Cab  
Long Box, 4x4/DRW  
K35953 – Extended Cab  
Long Box, 4x4/SRW  
K35953 – Extended Cab  
Long Box, 4x4/DRW  
K35943 – Crew Cab  
Long Box, 4x4/SRW  
K35943 – Crew Cab  
Long Box, 4x4/DRW  
SRW = Single Rear Wheels DRW = Dual Rear Wheels  
The chart below shows the maximum allowable Gross Combination Weight Ratings  
(GCWR) based on the available engines and axle ratios with automatic or manual  
transmissions. The GCWR includes the total loaded weight of both the truck and the  
trailer. Any available engine may be used for trailering if the GCWR shown is not exceeded.  
SIERRA 2500HD AND 3500 PICKUP GROSS COMBINATION WEIGHT RATINGS (GCWR)  
GCWR kg (lb.)  
7258 (16,000)  
9072 (20,000)  
9979 (22,000)  
10,660 (23,500)  
3.73**  
ENGINE  
AXLE RATIO REQUIRED WITH AUTOMATIC TRANSMISSION  
Vortec 6.0L V8*  
Vortec 8.1L V8  
Duramax 6.6L V8 Diesel  
4.10  
3.73  
4.10  
3.73  
ENGINE  
AXLE RATIO REQUIRED WITH MANUAL TRANSMISSION  
Vortec 6.0L V8*  
4.10  
**Rating is reduced by 454 kg (1000 lb.) when engine modified to operate on alternate fuels (CNG).  
**Rating for 3500 Series with Dual Rear Wheels (DRW).  
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11  
SIERRA 2500HD & 3500 PICKUPS WITH FIFTH-WHEEL HITCH  
Often used with the heaviest trailers, fifth-wheel (or gooseneck) hitches are mounted in a pickup’s box and bolted  
through the frame with the trailer’s kingpin weight located slightly in front of the tow vehicle’s rear axle. Fifth-wheel  
trailer kingpin loads are higher than ball hitch trailer tongue loads, so careful attention must be given to the truck’s  
payload capacity and rear-axle weight ratings (GAWR). Subtract the tow vehicle’s weight plus passenger and cargo  
weights from the GVWR to determine the available payload and/or kingpin weight allowance.  
FIFTH-WHEEL TRAILERING WITH SIERRA 2500HD AND 3500 PICKUPS  
ENGINE/TRANSMISSION  
Vortec 6.0L V8 (LQ4)  
Manual or Automatic  
Vortec 8.1L V8 (L18)  
Automatic 6-speed  
Duramax 6.6L V8 Diesel (LBZ)  
Automatic 6-speed  
Horsepower  
Torque (lb.-ft.)  
300 @ 4400  
360 @ 4000  
330 @ 4200  
450 @ 3200  
360 @ 3200  
650 @ 1600  
MODEL  
Max. Trailer  
Weight, kg (lb.)  
Axle Ratio  
Required  
Max. Trailer  
Weight, kg (lb.)  
Axle Ratio  
Required  
Max. Trailer  
Weight, kg (lb.)  
Axle Ratio  
Required  
2500HD - 4173 kg (9200 lb.) GVWR  
C25903 – Regular Cab  
Long Box, 2WD  
6395 (14,100)  
7303 (16,100)  
6305 (13,900)  
7212 (15,900)  
6214 (13,700)  
7122 (15,700)  
6169 (13,600)  
7076 (15,600)  
6124 (13,500)  
7031 (15,500)  
6260 (13,800)  
7167 (15,800)  
6169 (13,600)  
7076 (15,600)  
6078 (13,400)  
6985 (15,400)  
3.73  
4.10  
3.73  
4.10  
3.73  
4.10  
3.73  
4.10  
3.73  
4.10  
3.73  
4.10  
3.73  
4.10  
3.73  
4.10  
7212 (15,900)  
7122 (15,700)  
7031 (15,500)  
6985 (15,400)  
6849 (15,100)  
7076 (15,600)  
6985 (15,400)  
6713 (14,800)  
6441 (14,200)  
5988 (13,200)  
3.73  
3.73  
3.73  
3.73  
3.73  
3.73  
3.73  
3.73  
3.73  
3.73  
4763 (10,500)  
4672 (10,300)  
4627 (10,200)  
4581 (10,100)  
4536 (10,000)  
4672 (10,300)  
4536 (10,000)  
4491 (9900)  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
C25753 – Extended Cab  
Standard Box, 2WD  
C25953 – Extended Cab  
Long Box, 2WD  
C25743 – Crew Cab  
Standard Box, 2WD  
C25943 – Crew Cab  
Long Box, 2WD  
K25903 – Regular Cab  
Long Box, 4x4  
K25753 – Extended Cab  
Standard Box, 4x4  
K25953 – Extended Cab  
Long Box, 4x4  
K25743 – Crew Cab  
Standard Box, 4x4  
6033 (13,300)  
6940 (15,300)  
5988 (13,200)  
6623 (14,600)  
3.73  
4.10  
3.73  
4.10  
4445 (9800)  
K25943 – Crew Cab  
Long Box, 4x4  
4400 (9700)  
3500 - 4491 kg (9900 lb.) GVWR with Single Rear Wheels (SRW) / 4171 kg (11,400 lb.) GVWR with Dual Rear Wheels (DRW)  
C35953 – Extended Cab  
6940 (15,300)  
7530 (16,600)  
6849 (15,100)  
7439 (16,400)  
6985 (15,400)  
7575 (16,700)  
6804 (15,000)  
7394 (16,300)  
6668 (14,700)  
7258 (16,000)  
3.73  
3.73  
3.73  
3.73  
3.73  
3.73  
3.73  
3.73  
3.73  
3.73  
Long Box, 2WD/SRW  
4445 (9800)  
4400 (9700)  
4355 (9600)  
4309 (9500)  
4536 (10,000)  
4445 (9800)  
4355 (9600)  
4264 (9400)  
4264 (9400)  
4173 (9200)  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
7031 (15,500)  
6940 (15,300)  
6940 (15,300)  
6849 (15,100)  
7076 (15,600)  
6985 (15,400)  
6895 (15,200)  
6804 (15,000)  
6804 (15,000)  
6713 (14,800)  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
4.10  
C35953 – Extended Cab  
Long Box, 2WD/DRW  
C35943 – Crew Cab  
Long Box, 2WD/SRW  
C35943 – Crew Cab  
Long Box, 2WD/DRW  
K35903 – Regular Cab  
Long Box, 4x4/SRW  
K35903 – Regular Cab  
Long Box, 4x4/DRW  
K35953 – Extended Cab  
Long Box, 4x4/SRW  
K35953 – Extended Cab  
Long Box, 4x4/DRW  
K35943 – Crew Cab  
Long Box, 4x4/SRW  
K35943 – Crew Cab  
Long Box, 4x4/DRW  
SRW = Single Rear Wheels DRW = Dual Rear Wheels  
Sierra 3500 models  
with dual rear wheels  
provide an extra  
measure of stability,  
traction and braking –  
important attributes  
when towing heavy  
fifth-wheel trailers.  
Refer to the Gross Combination Weight Ratings shown on page 10 for allowable GCWRs.  
NOTES:  
• 2500HD and 3500 models have a weight-carrying hitch limit of  
3402 kg (7500 lb.) and require a weight-distributing hitch with trailer weights  
in excess of this limit.  
• Trailer kingpin weight should be 15-25% of total loaded trailer weight.  
• Trailering capacity may be limited by the tow vehicle’s ability to carry the  
trailer kingpin weight without exceeding the GVWR or Rear GAWR.  
Provision for an overdrive lock-out and manual control using a tap-up, tap-down  
feature on vehicles equipped with the Allison automatic transmission provides  
improved performance and control when towing heavy trailers.  
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12  
YUKON & YUKON XL – YUKON DENALI & YUKON XL DENALI  
They represent the latest evolution of the full-size SUV: the Yukon, Yukon XL and the Denali models. These SUVs  
offer high-capacity trailering capability. Improvements to the braking, steering, handling, suspensions and standard  
StabiliTrak vehicle stability enhancement system (except Yukon XL 2500) all help transform these SUVs into superior  
tow vehicles. Denali models add luxurious amenities, even more powerful engines and all-wheel-drive traction.  
TRAILERING WITH YUKON, YUKON XL AND DENALI  
ENGINE  
Vortec 4.8L V8 (LY2)*  
Vortec 5.3L V8 (LY5/LMG)** Vortec 5.3L V8 (LC9)** Vortec 6.0L V8 (LY6/L76)**  
Vortec 6.2L V8 (L92)  
Horsepower  
Torque (lb.-ft.)  
295 @ 5600  
305 @ 4800  
320 @ 5200  
340 @ 4200  
310 @ 5200  
335 @ 4400  
LY6 - 352 @ 5400  
383 @ 4300  
380 @ 5500  
417 @ 4400  
L76 - 366 @ 5500  
380 @ 4300  
MODEL  
Max. Trailer  
Weight kg (lb.)  
Axle Ratio  
Required  
Max. Trailer  
Weight kg (lb.)  
Axle Ratio  
Required  
Max. Trailer  
Weight kg (lb.)  
Axle Ratio  
Required  
Max. Trailer  
Weight kg (lb.)  
Axle Ratio  
Required  
Max. Trailer  
Weight kg (lb.)  
Axle Ratio  
Required  
C10706  
Yukon 2WD  
2041 (4500)  
2948 (6500)  
3.23  
3.73  
2948 (6500)  
3402 (7500)  
3.42  
3.73  
K10706  
Yukon 4x4  
3266 (7200)  
3720 (8200)  
3.73  
4.10  
K10706/Y91  
Yukon Denali AWD  
3583 (7900)  
4.10  
3.42  
3.42  
C10906  
Yukon XL 1500 2WD  
3221 (7100)  
3674 (8100)  
3175 (7000)  
3629 (8000)  
3.73  
4.10  
3.73  
4.10  
3720 (8200)  
K10906  
Yukon XL 1500 4x4  
3629 (8000)  
4.10  
K10906/Y91  
Yukon XL Denali AWD  
3583 (7900)  
C20906  
Yukon XL 2500 2WD  
3493 (7700)  
4400 (9700)  
3.73  
4.10  
K20906  
Yukon XL 2500 4x4  
3357 (7400)  
4264 (9400)  
3.73  
4.10  
*Available on Yukon SLE 1SA 2WD model only.  
**LY5 is only in 2WD Yukon and Yukon XL 1500. LMG is a Bi-fuel engine and is optional in 2WD models, standard in Yukon 4x4. LC9 is a Bi-fuel engine and is standard in Yukon XL 4x4 models. L76 is optional  
on Yukon XL 1500. LY6 is standard in Yukon XL 2500 models.  
NOTES:  
• The addition of trailer tongue weight must not cause vehicle weights to exceed  
the Rear Gross Axle Weight Rating (RGAWR) or Gross Vehicle Weight Rating  
GVWR). Trailering capacity may be limited by the tow vehicle’s ability to carry  
the trailer tongue weight.  
• Weight-Carrying Hitch Limit: 2268 kg (5000 lb.) trailer with 272 kg (600 lb.)  
Tongue Weight.  
• A Weight-Distributing Hitch and Sway Control is required over 2268 kg  
(5000 lb.) Trailer Weight.  
• Heavy-duty trailering equipment is standard on Yukon, Yukon XL and Denali.  
It includes a weight-distributing hitch platform with a 51 mm (2 in.) receiver,  
an independently fused trailering circuit mated to a 7-way sealed connector and  
electric brake controller provision with 4 blunt cut wires under the instrument  
panel. A high capacity engine air cleaner and heavy-duty auxiliary transmission  
oil cooler are also standard. An external engine oil cooler is standard on  
2500 Series Yukon XLs.  
• Trailer tongue weight should be 10-15% of the total loaded trailer weight  
up to 454 kg (1000 lb.) on the 1500 models and up to 680 kg (1500 lb.) on  
2500 models).  
GROSS COMBINATION WEIGHT RATINGS (GCWR)  
rear axle ratios with an automatic transmission. The GCWR includes the total  
loaded weight of both the truck and the trailer. Any available powertrain may be  
used for trailering if the GCWR shown is not exceeded.  
You may prefer to use Gross Combination Weight Ratings (GCWR) to determine the  
engine and rear axle ratios you will require to tow a specific trailer. This chart  
shows you the maximum allowable GCWR based on all the available engines and  
GCWR kg (lb.)  
4536 (10,000)  
3.23  
5443 (12,000)  
5897 (13,000)  
6350 (14,000)  
7258 (16,000)  
ENGINE/AXLE RATIOS  
Vortec 4.8L V8 (LY2)  
Vortec 5.3L V8 (ALL)  
Vortec 6.0L V8 (L76)  
Vortec 6.0L V8 (LY6)  
Vortec 6.2L V8 (L92)  
3.73  
3.42  
3.73  
4.10  
4.10  
3.73  
3.42  
4.10  
BALL HITCH TRAILERING  
ENGINE/TRANSMISSION  
EQUIPMENT  
3.6L V6/AUTOMATIC  
Maximum Trailer Weight kg (lb.)  
ACADIA  
All models without Trailer Towing Package  
907 (2000)  
All models with Trailer Towing Package (V92)  
2041 (4500)  
The all-new 2007 Acadia combines SUV capabilities with  
a smooth ride that puts you comfortably in control.  
Acadia’s Vortec 3.6L engine produces 275 horsepower  
and ample torque across a broad range of engine speeds.  
A six-speed automatic transmission and StabiliTrak are  
standard. Available active all-wheel drive can further  
enhance stability and control on a variety of road surfaces.  
NOTES:  
• Maximum trailer ratings are calculated assuming a standard equipped  
vehicle, driver and required trailering equipment. The weight of optional  
equipment, passengers and cargo will reduce the maximum trailer weight.  
10 to 15% of the trailer weight is the recommended trailer tongue load.  
• Maximum trailering capacity requires the available Trailer Towing Package  
(option V92) that includes a trailer wiring harness, heavy-duty cooling  
system and a trailer hitch holder. It does not include the actual hitch  
which should be selected to be compatible with the trailer’s coupler.  
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13  
CANYON PICKUP & CHASSIS CAB  
Canyons are designed for people who want a purposeful, mid-size pickup providing efficiency, driving and parking ease  
in a vehicle that meets their work and recreational needs. Canyons are true pickup trucks, with body-on-frame construction,  
Regular, Extended and Crew Cab models, manual or automatic transmissions, rear- or four-wheel drive, and ample  
power from two very fuel-efficient engines. Canyons provide outstanding performance, payload and towing capacity.  
BALL HITCH TRAILERING WITH CANYON PICKUP AND CHASSIS CAB  
ENGINE/TRANSMISSION  
Vortec 2.9L DOHC 4-cyl.  
5-speed manual  
Vortec 2.9L DOHC 4-cyl.  
Automatic Transmission  
Vortec 3.7L DOHC 5-cyl.  
Automatic Transmission  
Horsepower  
Torque (lb.-ft.)  
185 @ 5600  
190 @ 2800  
185 @ 5600  
190 @ 2800  
242 @ 5600  
242 @ 4600  
MODEL  
Max. Trailer  
Weight, kg (lb.)  
Axle  
Required  
Max. Trailer  
Weight, kg (lb.)  
Axle  
Required  
Max. Trailer  
Axle  
Required  
Weight, kg (lb.)  
1814 (4000)  
1814 (4000)  
1814 (4000)  
1814 (4000)  
1814 (4000)  
1814 (4000)  
1814 (4000)  
S15403  
Regular Cab, 2WD  
1043 (2300)  
3.73  
1497 (3300)  
3.73  
3.73  
3.73  
3.73  
3.73  
3.73  
3.73  
3.73  
S15603  
Chassis Cab 2WD  
S15653  
Extended Cab, 2WD  
953 (2100)  
862 (1900)  
907 (2000)  
907 (2000)  
3.73  
3.73  
3.73  
4.10  
1406 (3100)  
1315 (2900)  
1361 (3000)  
1361 (3000)  
3.73  
3.73  
3.73  
4.10  
S15643  
CrewCab, 2WD  
T15403  
Regular Cab, 4x4  
T15653  
Extended Cab, 4x4  
862 (1900)  
862 (1900)  
3.73  
4.10  
1315 (2900)  
1315 (2900)  
3.73  
4.10  
T15643  
Crew Cab, 4x4  
NOTES:  
• Maximum limits for a weight-carrying trailer hitch are 1814 kg (4000 lb.)  
for the trailer and 227 kg (500 lb.) of tongue weight. A weight-distributing  
hitch is not required.  
• Tongue weight must not cause vehicle weights to exceed Rear Gross Axle  
Weight Rating (RGAWR) or Gross Vehicle Weight Rating (GVWR).  
• Trailer hitch platform and 4-lead trailer wiring harness are available as  
dealer-installed accessories.  
• Trailer tongue weight should be 10-15% of the total loaded trailer weight,  
up to a maximum of 227 kg (500 lb.).  
GROSS COMBINATION WEIGHT RATINGS (GCWR)  
You may prefer to use Gross Combination Weight Ratings (GCWRs) to determine the  
engine and rear axle ratio you will require to tow a specific trailer with your Canyon.  
The chart below shows you the maximum allowable GCWR based on all the available  
engines and axle ratios for both automatic and manual transmission equipped vehicles.  
The GCWR includes the total loaded weight of both the tow vehicle and the trailer.  
Any available powertrain may be used for trailering if the GCWR shown is not exceeded.  
GCWR kg (lb.)  
2722 (6000)  
3175 (7000)  
4082 (9000)  
ENGINE  
AXLE RATIO WITH AUTOMATIC TRANSMISSION  
Vortec 2.9L DOHC 4-cylinder  
Vortec 3.7 DOHC 5-cylinder  
ENGINE  
3.73/4.10  
3.73  
AXLE RATIO WITH MANUAL TRANSMISSION  
Vortec 2.9L DOHC 4-cylinder  
3.73/4.10  
PONTIAC TORRENT  
Torrent provides impressive versatility and standard V6 power, a bonus in the compact SUV class, for superior  
trailering performance.  
NOTES:  
BALL HITCH TRAILERING  
• Maximum trailer ratings are calculated assuming standard equipped vehicle,  
ENGINE/TRANSMISSION  
EQUIPMENT  
3.4L V6/AUTOMATIC  
Maximum Trailer Weight kg (lb.)  
driver and required trailering equipment. The weight of optional equipment,  
passengers and cargo will reduce the maximum trailer weight your vehicle can  
tow. 10 to 15% of the trailer weight is the recommended trailer tongue load.  
All models  
1588 (3500)  
• Trailering capacity may be limited by tow vehicle ability to carry trailer tongue weight.  
• A Trailer Towing Package including a 4-pin harness connector and trailer  
hitch receiver is available to facilitate trailering with a Torrent.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
14  
ENVOY, ENVOY DENALI & BUICK RAINIER  
With a 291-horsepower Vortec 4.2L engine, these SUVs can really haul. They have just the kind of torque required for  
trailering, achieving 90 percent of peak torque from only 1600 up to 5600 rpm. The Vortec 5.3L V8, with fuel-saving  
TM  
Active Fuel Management, standard in Denali models and available in Rainier, adds an extra measure of performance  
when hauling heavier trailers.  
BALL HITCH TRAILERING WITH ENVOY, ENVOY DENALI AND RAINIER  
ENGINE  
Vortec 4.2L I-6 (LL8)  
Vortec 5.3L V8 (LH6)  
Horsepower  
Torque (lb.-ft.)  
291 @ 6000  
277 @ 4800  
302 @ 5200  
330 @ 4000  
MODEL  
Max. Trailer  
Weight kg (lb.)  
Axle Ratio  
Required  
Max. Trailer  
Weight kg (lb.)  
Axle Ratio  
Required  
S15506  
Envoy, 2WD  
2404 (5300)  
2630 (5800)  
2857 (6300)  
3.42  
3.73  
4.10  
T15506  
Envoy, 4x4  
2359 (5200)  
2586 (5700)  
2812 (6200)  
3.42  
3.73  
4.10  
T15506/Y91  
Envoy Denali  
2767 (6100)  
2948 (6500)  
3.42  
4.10  
T15506  
Buick Rainier, AWD  
2540 (5600)  
2767 (6100)  
3.73  
4.10  
2994 (6600)  
3.73  
NOTES:  
GROSS COMBINATION WEIGHT RATING (GCWR)  
• All of the above models include, as standard equipment, an integrated platform  
hitch receiver on the rear bumper and a 7-pin wiring harness connector. The  
cooling system includes all content required to attain the maximum trailer ratings.  
GCWRs include the total loaded weight of the tow vehicle and the trailer combined.  
The chart below shows you maximum allowable GCWRs with specific axle ratios.  
GCWR kg  
(lb.)  
Vortec 4.2L I-6  
Vortec 5.3L V8  
– Envoy Denali & Rainier  
4536  
(10,000)  
3.42  
4763  
(10,500)  
3.73  
4990  
(11,000)  
4.10  
5216  
(11,500)  
• The trailer tongue weight should be 10-15% of the loaded trailer weight, up to a  
maximum of 340 kg (750 lb.).  
• Weight-carrying hitch limit is a 1814 kg (4000 lb.) trailer with 181 kg (400 lb.)  
tongue weight.  
3.42  
3.73  
• Weight-Distributing Hitch and Sway Control is required over 1814 kg (4000 lb.)  
trailer weight.  
• 4x4 models of Envoy and Denali can be flat-towed in the neutral position.  
PONTIAC MONTANA SV6 & BUICK TERRAZA & RENDEZVOUS  
These front-wheel-drive vehicles combine excellent fuel efficiency, passenger comfort and road manners with  
trailer-towing capability.  
BALL HITCH TRAILERING  
Trailering Package includes:  
• 125-amp alternator  
NOTE:  
ENGINE/TRANSMISSION  
EQUIPMENT  
3500 or 3900 V6/AUTOMATIC  
Some of the equipment shown in  
Trailering Package may be included in  
the specific model selected and/or  
additional equipment must be  
specified. A trailer hitch is a dealer  
installed accessory and should be  
selected to match the trailer’s coupler.  
Maximum Trailer Weight kg (lb.)  
• P225/60R17 All Season tires  
• Trailer wiring harness  
With standard equipment  
With Trailering Package**  
**Capacities based on up to two occupants and no cargo. The weight of additional passengers,  
cargo or equipment must be subtracted from these ratings.  
907 (2000)*  
1588 (3500)*  
• Heavy-duty turn signal flasher  
• Heavy-duty radiator and  
transmission oil cooler  
**Available on Extended Wheelbase models.  
• Automatic load-levelling suspension  
wiith inflator kit on most models  
Download from Www.Somanuals.com. All Manuals Search And Download.  
15  
SAVANA CARGO & PASSENGER VANS  
As the largest and most capable vans in GMC’s long and illustrious history, the full-size Savanas are ideal tow  
vehicles. Along with massive capacity and rock-solid strength, Savanas have all the power you need for accelerating  
and merging with a trailer in tow. With the 300 horsepower Vortec 6.0L V8, Savana can tow up to 4536 kg (10,000 lb.)  
when properly equipped. And now the efficiency of diesel power is available in 2500/3500 Cargo models – the  
Duramax 6.6L V8 produces 460 lb.-ft. of torque.  
BALL HITCH TRAILERING WITH SAVANA CARGO MODELS  
ENGINE  
VORTEC 4.3L V6 (LU3)  
VORTEC 4.8L V8 (LR4)  
VORTEC 5.3L V8 (LM7/L59)  
VORTEC 6.0L V8 (LQ4)  
DURAMAX 6.6L DIESEL V8 (LLY)  
Horsepower  
Torque (lb.-ft.)  
195 @ 4600  
260 @ 2800  
285 @ 5200  
295 @ 4000  
295 @ 5200  
335 @ 4000  
300 @ 4400  
360 @ 4000  
250 @ 3000  
460 @ 1600  
SERIES/MODEL  
Max. Trailer  
Weight  
kg (lb.)  
Axle Ratio  
Required  
Max. Trailer  
Weight  
kg (lb.)  
Axle Ratio  
Required  
Max. Trailer  
Weight  
kg (lb.)  
Axle Ratio  
Required  
Max. Trailer  
Weight  
kg (lb.)  
Axle Ratio  
Required  
Max. Trailer  
Weight  
kg (lb.)  
Axle Ratio  
Required  
G13405  
1500 – RWB – RWD  
1950 (4300)  
3.42  
2676 (5900)  
2676 (5900)  
3.42  
3.73  
H13405  
1500 – RWB – AWD  
2948 (6500)  
2948 (6500)  
3.42  
3.73  
G23405  
2500 – RWB – RWD  
2858 (6300)  
3311 (7300)  
2767 (6100)  
3221 (7100)  
2812 (6200)  
3266 (7200)  
2721 (6000)  
3175 (7000)  
3.73  
4.10  
3.73  
4.10  
3.73  
4.10  
3.73  
4.10  
3765 (8300)  
3.73  
4.10  
3.73  
4.10  
3.73  
4.10  
3.73  
4.10  
4536 (10,000)  
4536 (10,000)  
4536 (10,000)  
4536 (10,000)  
3.73  
3.73  
3.73  
3.73  
4536 (10,000)  
G23705  
2500 – LWB – RWD  
3674 (8100)  
4536 (10,000)  
3720 (8200)  
4536 (10,000)  
3629 (8000)  
4536 (10,000)  
G33405  
3500 – RWB – RWD  
G33705  
3500 – LWB – RWD  
BALL HITCH TRAILERING WITH SAVANA PASSENGER MODELS  
ENGINE  
Vortec 4.8L V8 (LR4)  
Vortec 5.3L V8 (LM7/L59)  
Vortec 6.0L V8 (LQ4)  
SERIES/MODEL  
Max. Trailer  
Weight, kg (lb.)  
Axle  
Required  
Max. Trailer  
Weight, kg (lb.)  
Axle  
Required  
Max. Trailer  
Weight, kg (lb.)  
Axle  
Required  
G13406  
1500 – RWB – RWD  
2858 (6300)  
2858 (6300)  
3.42  
3.73  
H13406  
1500 – RWB – AWD  
2767 (6100)  
2767 (6100)  
3.42  
3.73  
G23406  
2500 – RWB – RWD  
2858 (5800)  
3084 (6800)  
3.73  
4.10  
3538 (7800)  
4445 (9800)  
3.73  
4.10  
G33406  
3500 – RWB – RWD  
3493 (7700)  
3.73  
G33706  
3500 – LWB – RWD  
3357 (7400)  
3.73  
RWB – Regular wheelbase. LWB – Long wheelbase. RWD – Rear-wheel Drive. AWD – All-wheel Drive.  
NOTES:  
• Savana vans are not equipped or recommended for trailering with a bumper-  
mounted ball hitch. If you’ll be towing a trailer, be sure to use a frame-  
mounted hitch of the proper size.  
• The trailering tongue weight should be 10-15% of total loaded trailer weight,  
up to 454 kg (1000 lb.).  
• The Z82 Trailering Special Equipment Package includes a weight-distributing  
hitch platform and a 7-wire trailer wiring harness.  
• Any GMC Savana can tow a 907 kg (2000 lb.) trailer without special equipment,  
except for the appropriate hitch and wiring.  
• The base cooling system for vans with a GVWR under 3900 kg (8600 lb.)  
includes all that is required to attain the maximum trailer rating. An auxiliary  
transmission oil cooler is required on vans with a GVWR of 3900 kg (8600 lb.),  
or higher, equipped with a Vortec gasoline engine when the trailer weight exceeds  
1814 kg (4000 lb.).  
• The weight-carrying hitch limit is a 1814 kg (4000 lb.) trailer with a 181 kg  
(400 lb.) tongue weight.  
• Savana vans towing trailers weighing over 1814 kg (4000 lb.) require a  
weight-distributing hitch platform, which is included with optional Z82  
Trailering Special Equipment Package.  
• The standard electrical system was designed to handle one additional  
stop/turn light bulb per tail light circuit. The addition of more than one  
bulb per circuit may result in damage to the electrical system unless  
equipped with the optional 7-wire trailer wiring harness.  
GROSS COMBINATION WEIGHT RATINGS (GCWR)  
You may prefer to use Gross Combination Weight Ratings (GCWR) to determine the  
engine and rear axle ratio you will require to tow a specific trailer with your GMC  
Savana. The chart below shows you the maximum allowable GCWR based on all the  
available engines and rear axle ratios. The GCWR includes the total loaded weight  
of both the truck and the trailer. Any available engine may be used for trailering if  
the GCWR shown is not exceeded.  
GCWR kg (lb.)  
4309 (9500)  
3.42  
4536 (10,000)  
3.73  
5443 (12,000)  
5897 (13,000)  
6350 (14,000)  
7258 (16,000)  
7711 (17,000)  
8392 (18,500)  
ENGINE  
AXLE RATIO WITH AUTOMATIC TRANSMISSION  
Vortec 4.3L V6  
Vortec 4.8L V8  
Vortec 5.3L V8  
Vortec 6.0L V8  
Duramax 6.6L V8 Diesel  
3.73  
3.42/3.73  
4.10  
3.73  
4.10  
3.73  
3.73*  
*G33803/G33903 Special cutaway models with dual rear wheels.  
NOTE: Model availability of the above driveline combinations must be verified  
by your GMC dealer. Savana Special cutaway models are incomplete vehicles  
and trailer ratings are not assigned; use this GCWR chart to determine  
powertrain requirements and combination weight limit.  
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16  
WORKSHEET  
The answers to these 12 questions provide you with helpful information required for selecting the right truck to  
Fill out this worksheet and review it with your sales consultant as you spec your new vehicle.  
1. What is the weight of your boat and/or trailer (including all cargo)?  
2. Maximum towing ratings include a weight allowance for only the driver.  
How many additional passengers will be in the vehicle when you are towing?  
3. What is the weight of other equipment and cargo in the tow vehicle?  
4. How much of the vehicle’s driving time will be spent towing?  
I 0-25%  
I 25-50%  
I 50-75%  
I 75-100%  
5. What special conditions requiring the added traction of a locking differential and/or 4-wheel drive will you encounter while towing?  
I Off-road  
I Unfinished roads  
I Snow-covered roads  
I Boat ramps  
6. What is the height and width of your boat or trailer?  
7. Will you be towing over short or long distances?  
I Short  
I Long  
8. When trailering, which of the following special conditions will you encounter?  
I Steep grades  
I Mountains  
I High altitudes  
I Extreme temperatures  
9. What type of hitch does your trailer require?  
I Weight-carrying (Bumper Hitch)  
I Weight-distributing  
I Fifth-wheel  
10. Is your trailer equipped with trailer brakes?  
I Yes  
I No  
Type  
11. What type of electrical connection does your trailer require?  
12. Will your towing needs increase in the future?  
I Yes  
I No  
A WORD ABOUT THIS BROCHURE  
Some of the equipment shown or described throughout this brochure may be available at extra cost. This brochure is based on the latest information at the time of production. General Motors of Canada Limited reserves  
the right to make changes at any time, without notice, to specifications, equipment, colours, models, availability, programs and services. Your GMC dealer is the best source for up-to-date information. General Motors, GM, the GM  
emblem, the GM Canada website address, GMC, the GMC emblem, Acadia, Autotrac, Canyon, Denali, Dexron, Duramax, Envoy, Montana SV6, Rainier, Rendezvous, Savana, Sierra, Terraza, Torrent, Yukon, Yukon XL, Vortec and  
VortecMAX are all trade marks of the General Motors Corporation and/or General Motors of Canada Limited. © Copyright 2006 General Motors of Canada Limited.  
gmcanada.com  
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