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.
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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.
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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
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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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