capability

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CAPABILITY

ENGINEERED TO DOMINATE

The 2021 Sierra Heavy Duty pickup truck offers up to 36,000 lbs of max towing. It’s built strong so you can tow strong. Its large drive shaft and rear axle will give you increased durability and strength. And its improved brakes and steering offer superior control.

POWER TO GO BEYOND THE PAVEMENT

ADVANCED ENGINES & TRANSMISSIONS

The 2021 Sierra Heavy Duty truck features advanced engines and transmissions that power a confident driving and trailering experience:

  • 6.6L V8 Gas Engine
  • Available 6.6L Duramax® Turbo-Diesel V8 Engine with Allison® 10-Speed Automatic Transmission

Learn more about engine capability at GMC Life.

2500 ENGINES

6.6 L V-8 Gasoline

6.6 L V-8 Turbo Diesel

CYLINDER HEAD MATERIAL

Cast Aluminum

Cast Aluminum

COMPRESSION RATIO

10.75 : 1

16 : 1

VALVETRAIN

Overhead-valve, two valves per cylinder, variable valve trimming

Overhead-valve, four valves per cylinder

FUEL DELIVERY

Direct Fuel Injection

Common-Rail Direct Fuel Injection

HORSEPOWER (hp @rpm)

401 @5200

445 @2800

TORQUE (lb.-ft @rpm)

464 @4000

910 @1600

2500 TRANSMISSIONS & AXLES

6L90 SIX-SPEED AUTOMATIC TRANSMISSION (6.6L GAS)

ALLISON 10-SPEED AUTOMATIC TRANSMISSION (6.6L DIESEL)

GEAR RATIOS (:1)

6L90

10L1000

FIRST GEAR

4.03

4.54

SECOND GEAR

2.36

2.87

THIRD GEAR

1.53

2.06

FOURTH GEAR

1.15

1.72

FIFTH GEAR

0.85

1.48

SIXTH GEAR

0.67

1.26

SEVENTH GEAR

1.00

EIGHTH GEAR

0.85

NINTH GEAR

0.69

TENTH

0.63

REVERSE

3.06

4.54

AXLE RATIO

3.73

3.42

REAR AXLE RING GEAR SIZE

11.5 in.

11.5 in.

3500 ENGINES

6.6 L V8 Gasoline

6.6 L V8 Turbo Diesel

CYLINDER HEAD MATERIAL

Cast Aluminum

Cast Aluminum

COMPRESSION RATIO

10.75 : 1

16 : 1

VALVETRAIN

Overhead-valve, two valves per cylinder, variable valve trimming

Overhead-valve, four valves per cylinder

FUEL DELIVERY

Direct Fuel Injection

Common-Rail Direct Fuel Injection

HORSEPOWER (hp @rpm)

401 @5200

445 @2800

TORQUE (lb.-ft @rpm)

464 @ 4000

910 @1600

3500 TRANSMISSIONS & AXLES

6L90 SIX-SPEED AUTOMATIC TRANSMISSION (6.6L GAS)

ALLISON 10-SPEED AUTOMATIC TRANSMISSION (6.6L DIESEL)

GEAR RATIOS (:1)

6L90

10L1000

FIRST GEAR

4.03

4.54

SECOND GEAR

2.36

2.87

THIRD GEAR

1.53

2.06

FOURTH GEAR

1.15

1.72

FIFTH GEAR

0.85

1.48

SIXTH GEAR

0.67

1.26

SEVENTH GEAR

1.00

EIGHTH GEAR

0.85

NINTH GEAR

0.69

TENTH

0.63

REVERSE

3.06

4.54

AXLE RATIO

3.73

3.42

REAR AXLE RING GEAR SIZE

11.5 in.

12 in.

2500 DIESEL TOWING & PAYLOAD

4WD CREW CAB STANDARD BOX

4WD CREW CAB LONG BOX

MAX GCWR

27,500 LBS

27,500 LBS

MAX CONVENTIONAL HITCH

18,500 LBS

18,500 LBS

MAX FIFTH WHEEL HITCH

18,500 LBS

18,500 LBS

MAX GOOSENECK  HITCH

18,500 LBS

18,500 LBS

MAX PAYLOAD

3,563 LBS

3,597 LBS

2500 GAS TOWING & PAYLOAD

4WD CREW CAB STANDARD BOX

4WD CREW CAB LONG BOX

MAX GCWR

24,000 LBS

24,000 LBS

MAX CONVENTIONAL HITCH

14,500 LBS

14,500 LBS

MAX FIFTH WHEEL HITCH

16,620 LBS

16,520 LBS

MAX GOOSENECK HITCH

16,620 LBS

16,520 LBS

MAX PAYLOAD

3,760 LBS

3,862 LBS

3500 DIESEL TOWING & PAYLOAD

4WD CREW CAB STANDARD BOX

4WD CREW CAB LONG BOX SRW

4WD CREW CAB LONG BOX DRW

MAX GCWR

29,700 LBS

29,700 LBS

40,000 LBS

MAX CONVENTIONAL HITCH

20,000 LBS

20,000 LBS

20,000 LBS

MAX FIFTH WHEEL HITCH

21,300 LBS

21,040 LBS

31,180 LBS

MAX GOOSENECK HITCH

21,300 LBS

21,040 LBS

31,180 LBS

MAX PAYLOAD

4,185 LBS

4,078 LBS

5,607 LBS

3500 GAS TOWING & PAYLOAD

4WD CREW CAB STANDARD BOX

SRW CREW CABLONG BOX 4WD

DENALI DRW CREW CAB LONG BOX 4WD

MAX GCWR

24,000 LBS

24,000 LBS

24,000 LBS

MAX CONVENTIONAL HITCH

14,500 LBS

14,500 LBS

16,240 LBS

MAX FIFTH WHEEL HITCH

16,530 LBS

16,410 LBS

16,120 LBS

MAX GOOSENECK HITCH

16,530 LBS

16,410 LBS

16,120 LBS

MAX PAYLOAD

4,365 LBS

4,398 LBS

6,610 LBS

AT4 & DENALI’S HEAVY DUTY CAPABILITY

RESPONSIVE SUSPENSIONS

  • AT4 & Denali’s independent front suspensions provide excellent wheel alignment, ride comfort and turnability with reduced weight
  • Live-axle suspension includes two-stage, semielliptic multileaf rear springs to balance payload management and ride quality

OPTIMAL ENGINE PERFORMANCE

To help maintain optimal operating temperatures of the available 6.6L Duramax® Turbo Diesel V8 engine, a massive 28" variable-speed cooling fan was added. Dense, cool air from the Dual Path Air Induction System is drawn through both the hood scoop and the large grille to maximize horsepower and help optimize trailering performance. The factory-installed Diesel After-Run feature is designed to help cool down the engine following heavy usage.

STOPPING & GOING POWER

AVAILABLE AUTO ELECTRIC PARKING BRAKE

To help with positioning, after backing up to a trailer hitch using available Hitch View, Sierra Heavy Duty will automatically apply the electric parking brake upon shifting into park to avoid unintentional rolling.

PARK GRADE HOLD ASSIST

Prevents movement when shifting out of park on a hill and moving a foot from brake to accelerator pedal by automatically applying brakes at each wheel for an extended period of time while trailering.

AVAILABLE DIGITAL VARIABLE STEERING ASSIST

Eases driver’s steering effort when maneuvering at low speeds, reduces the steering effort needed to return the heavy-duty truck to center, and adapts to crowned road surfaces, reducing the need to correct steering over long stretches of uneven road. It includes new enhancements to help with driving response, especially when trailering or when carrying a heavy load.

AVAILABLE 2-SPEED AUTOTRAC TRANSFER CASE

Sierra is the first heavy-duty truck in its class to offer a 2-speed AutoTrac transfer case with an active automatic 4WD setting, which provides seamless shifting between two- and four-wheel drive based on road conditions.

AVAILABLE TRACTION SELECT SYSTEM WITH TOW/HAUL MODE AND OFF-ROAD MODE
  • Allows you to quickly switch between multiple traction configurations, including Off-Road mode and Tow/Haul mode, to optimize powertrain calibrations, traction control settings and stability control system calibrations for a variety of terrain and driving conditions
  • The system will retain the Tow/Haul setting configurations for up to 4 hours after the vehicle is turned off, eliminating the need to reengage the system when returning from a brief stop on a long journey

AVAILABLE AUTO ELECTRIC PARKING BRAKE

To help with positioning, after backing up to a trailer hitch using available Hitch View, Sierra Heavy Duty will automatically apply the electric parking brake upon shifting into park to avoid unintentional rolling.

PARK GRADE HOLD ASSIST

Prevents movement when shifting out of park on a hill and moving a foot from brake to accelerator pedal by automatically applying brakes at each wheel for an extended period of time while trailering.

AVAILABLE DIGITAL VARIABLE STEERING ASSIST

Eases driver’s steering effort when maneuvering at low speeds, reduces the steering effort needed to return the heavy duty truck to center, and adapts to crowned road surfaces, reducing the need to correct steering over long stretches of uneven road. It includes new enhancements to help with driving response, especially when trailering or when carrying a heavy load.

AVAILABLE 2-SPEED AUTOTRAC TRANSFER CASE

Sierra is the first heavy-duty truck in its class to offer a 2-speed AutoTrac transfer case with an active automatic 4WD setting, which provides seamless shifting between two- and four-wheel drive based on road conditions.

AVAILABLE TRACTION SELECT SYSTEM WITH TOW/HAUL MODE AND OFF-ROAD MODE

  • Allows you to quickly switch between multiple traction configurations, including Off-Road mode and Tow/Haul mode, to optimize powertrain calibrations, traction control settings and stability control system calibrations for a variety of terrain and driving conditions
  • The system will retain the Tow/Haul setting configurations for up to 4 hours after the vehicle is turned off, eliminating the need to reengage the system when returning from a brief stop on a long journey

ADVENTUROUS PACKAGES

X31 OFF ROAD PACKAGE

  • Off-road suspension
  • Twin-Tube Rancho® shocks
  • Eaton® automatic locking rear differential
  • Underbody skid plates

GOOSENECK/5TH WHEEL HITCH PACKAGE

  • Hitch platform to accept gooseneck or fifth-wheel hitch
  • Hitch platform with tray to accept ball and stamped bed holes with removable caps installed
  • Bed-mounted 7-pin trailer harness
  • Bed View Camera

NEXT STEPS

  • Requires Sierra 3500 HD Regular Cab Long Bed 2WD DRW with available Duramax 6.6L Turbo-Diesel V8, Max Trailering Package and gooseneck hitch. Before you buy a vehicle or use it for trailering, carefully review the Trailering section of the Owner’s Manual. The weight of passengers, cargo and options or accessories may reduce the amount you can tow.

  • Gross Combination Weight Rating (GCWR). When properly equipped; includes weight of vehicle and trailer combination, including the weight of driver, passengers, fuel, optional equipment and cargo in the vehicle and trailer.

  • Requires properly equipped vehicle. Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner’s Manual. The weight of passengers, cargo and options or accessories may reduce the amount you can tow.

  • These maximum payload ratings are intended for comparison purposes only. Before you buy a vehicle or use it to haul people or cargo, carefully review the vehicle loading section of the Owner’s Manual and check the carrying capacity of your specific vehicle on the label on the inside of the driver’s door jamb.

  • Read the vehicle’s Owner’s Manual for important feature limitations and information.

  • 7,700-lb rating requires a properly equipped 2WD Canyon Elevation Crew Cab short bed model with available Duramax 2.8L I4 Diesel engine and Trailering Package. Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner’s Manual. The weight of passengers, cargo and options or accessories may reduce the amount you can tow.

  • The Manufacturer's Suggested Retail Price excludes destination freight charge, tax, title, license, dealer fees and optional equipment. See your GMC dealer for details. Click here to see all GMC destination freight charges.

  • Requires 4WD Double Cab with available 6.2L V8 and Max Trailering Package. Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner’s Manual. The weight of passengers, cargo and options or accessories may reduce the amount you can tow.

  • Requires properly equipped 3500 Regular Cab DRW Long Box 2WD model with available 6.6L Duramax Turbo Diesel engine and gooseneck hitch. Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner’s Manual. The weight of passengers, cargo and options or accessories may reduce the amount you can tow.

  • SLE models only.

  • 7,550-lb rating requires a properly equipped 4WD Canyon Denali model with available Duramax 2.8L I4 Diesel engine. Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner’s Manual. The weight of passengers, cargo and options oraccessories may reduce the amount you can tow.

  • Requires 2WD Denali Short Box model with 5.3L V-8 engine. Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner’s Manual. The weight of passengers, cargo and options or accessories may reduce the amount you can tow.

  • Requires properly equipped 3500 Crew Cab DRW Long Box 4WD model with available 6.6L Duramax Turbo Diesel engine and fifth wheel or gooseneck hitch. Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner’s Manual. The weight of passengers, cargo and options or accessories may reduce the amount you can tow.

  • Savana Passenger's 9,600-lb rating requires a 2500 or 3500 Regular wheelbase model with available 6.0L V8 engine and trailering equipment package. Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner’s Manual. The weight of passengers, cargo and options or accessories may reduce the amount you can tow.

  • Savana Cargo’s 10,000-lb rating requires  the available 6.0L V8 engine and trailering equipment package.  Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner’s Manual.  The weight of passengers, cargo and options or accessories may reduce the amount you can tow.

  • Savana Cutaway’s 8,940-lb rating requires a 4500 Series 159" Wheelbase model with available 6.0L V8 engine. These maximum payload ratings are intended for comparison purposes only. Before you buy a vehicle or use it to haul people or cargo, carefully review the vehicle loading section of the Owner’s Manual and check the carrying capacity of your specific vehicle on the label on the inside of the driver’s door jamb.

  • Maximum Gross Vehicle Weight Rating (GVWR). When properly equipped; includes weight of vehicle, passengers, cargo and equipment.

  • Canyon’s 7000-lb rating requires available trailering package and 3.6L V-6 engine. Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner’s Manual. The weight of passengers, cargo and options or accessories may reduce the amount you can tow.

  • Sierra's 12,500-lb rating requires Sierra Double Cab or Crew Cab Short box 2wd with 6.2L EcoTec3 V8 engine and NHT Max Trailering Package. Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner’s Manual. The weight of passengers, cargo and options or accessories may reduce the amount you can tow.

  • Trailer weight ratings are calculated assuming properly equipped vehicle, plus driver and one passenger. The weight of other optional equipment, passengers and cargo will reduce the trailer weight your vehicle can tow. See dealer for details.

  • Sierra Denali's 9,300-lb rating requires 2wd. Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner’s Manual. The weight of passengers, cargo and options or accessories may reduce the amount you can tow.

  • Savana Passenger's 10,000-lb rating requires 2500 Wheel Base with 6.0L V8 engine. Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner’s Manual. The weight of passengers, cargo and options or accessories may reduce the amount you can tow.

  • Savana Cargo's 10,000-lb rating requires 6.0L V8 engine. Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner’s Manual. The weight of passengers, cargo and options or accessories may reduce the amount you can tow.

  • These maximum payload ratings are intended for comparison purposes only. Before you buy a vehicle or use it to haul people or cargo, carefully review the vehicle loading section of the Owner’s Manual and check the carrying capacity of your specific vehicle on the label on the inside of the driver’s door jamb.

  • Gross Combination Weight Rating (GCWR). When properly equipped, includes weight of vehicle, passengers, cargo and equipment.

  • Canyon’s 7700-lb rating requires 2WD Crew Cab model with available Duramax 2.8L I-4 Diesel engine. Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner’s Manual. The weight of passengers, cargo and options or accessories may reduce the amount you can tow.

  • Requires 2WD Crew Cab DRW equipped with 6.6L Duramax Diesel and fifth-wheel or gooseneck hitch. Trailer weight ratings are calculated assuming properly equipped vehicle, plus driver and one passenger. The weight of other optional equipment, passengers and cargo will reduce the trailer weight your vehicle can tow. See dealer for details.

  • Starting at price for base Sierra HD. The Manufacturer's Suggested Retail Price excludes destination freight charge, tax, title, license, dealer fees and optional equipment. See your GMC dealer for details. Click here to see all GMC destination freight charges.

  • Requires properly equipped 3500 Regular Cab DRW Long Box 2WD model with available 6.6L Duramax Turbo Diesel engine and gooseneck hitch. Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner’s Manual. The weight of passengers, cargo and options or accessories may reduce the amount you can tow.

  • Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner’s Manual. The weight of passengers, cargo and options or accessories may reduce the amount you can tow.

  • The Manufacturer's Suggested Retail Price excludes destination freight charge, tax, title, license, dealer fees and optional equipment. See your GMC dealer for details. Click here to see all GMC destination freight charges. Bed/Roof-Mounted Bicycle Carriers shown. Requires crossbars or Thule Rack Solution. Non-GM warranty. Warranty by Thule®. See dealer for more information.

  • Available. Requires 2.0L Turbocharged gas engine.

  • Terrain's 3,500-lb rating requires available 2.0L Turbocharged gas engine and available trailering equipment. Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner’s Manual. The weight of passengers, cargo and options or accessories may reduce the amount you can tow.

  • Requires available 3.6L V6 engine. Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner’s Manual. The weight of passengers, cargo and options or accessories may reduce the amount you can tow.

  • Yukon’s 8,500-lb rating requires short wheelbase 2wd with 5.3L EcoTec3 V8 engine and HD Trailering Package. Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner’s Manual. The weight of passengers, cargo and options or accessories may reduce the amount you can tow.

  • Requires 2WD Denali Short Box model with 5.3L V-8 engine. Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner’s Manual. The weight of passengers, cargo and options or accessories may reduce the amount you can tow.

  • Savana Cutaway’s 9,006-lb rating requires a 4500 Series 159" Wheelbase model with available 6.0L V8 engine. These maximum payload ratings are intended for comparison purposes only. Before you buy a vehicle or use it to haul people or cargo, carefully review the vehicle loading section of the Owner’s Manual and check the carrying capacity of your specific vehicle on the label on the inside of the driver’s door jamb.

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