CAPABILITY

Due to current supply-chain shortages, certain features shown have limited or late availability, or are no longer available. See the window label or a dealer regarding the features on an individual vehicle.

ENGINEERED TO PERFORM

The 2023 Sierra Heavy Duty pickup truck offers up to 36,000 lbs. of available max towing. It’s built strong so you can tow strong. The large drive shaft and rear axle will give you exceptional durability and strength, and its powerful brakes and steering offer superior control.

SEE WHAT'S UNDER THE HOOD

  • 401 HP
  • 464 lb.-ft. of torque
  • 6-Speed Automatic Transmission
  • 10.8:1 compression ratio
  • Valvetrain: Overhead-valve (two valves per cylinder) with variable valve timing

DIESEL TECHNOLOGY

Efficient, responsive and powerful — get familiar with Sierra Heavy Duty’s available Duramax® Turbo-Diesel engine capabilities.

AVAILABLE 6.6L DURAMAX TURBO-DIESEL V8 ENGINE

HORSEPOWER

445 HP

TORQUE

910 LB.-FT.

MAX TOWING (LBS)

36,000 LBS.

MAX PAYLOAD (LBS)

7,442 LBS.

AUTOMATIC TRANSMISSION

Allison® 10-Speed

AXLE RATIO

3.42

CAPABILITY WITHOUT COMPROMISE

While the 2023 Sierra Heavy Duty offers powertrain advancements across the lineup, the legendary available Duramax Diesel engine and 10-Speed Allison Automatic Transmission continue to offer the in pulling power excellence:

  • The 6.6L Duramax Turbo-Diesel V8 engine delivers an impressive 445 HP and 910 lb.-ft. of torque
  • The Allison 10-Speed Automatic Transmission allows the engine to operate in an optimal range with varying load and terrain conditions
OPTIMIZED ENGINE PERFORMANCE

Engineers worked to make this already powerful engine perform more efficiently by optimizing its cooling capacity by way of a large radiator and fan and improving the air induction system.

  • The dual-path intake system draws dense, cool air to enhance performance
  • To help maintain optimal operating temperatures, the available Duramax Diesel features an integrated engine after-run cooling function
  • The integrated engine after-run cooling function can continue to idle the engine after extended and exhaustive periods of use and allows for proper cool-down of vital underhood components

ADVANCED ENGINES & TRANSMISSIONS

2500 ENGINES

6.6 L V8 Gasoline

6.6 L V8 Turbo Diesel

CYLINDER HEAD MATERIAL

Cast Aluminum

Cast Aluminum

COMPRESSION RATIO

10.8 : 1

16.0 : 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

0.68

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

10.8 : 1

16.0 : 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

0.68

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.

TOWING AND PAYLOAD TABLES

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

16,650 LBS

16,550 LBS

MAX GOOSENECK HITCH

16,650 LBS

16,550 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

5,662 LBS

3500 GAS TOWING & PAYLOAD

4WD CREW CAB STANDARD BOX

SRW CREW CAB LONG 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

16,010 LBS

MAX FIFTH WHEEL HITCH

16,530 LBS

16,410 LBS

15,890 LBS

MAX GOOSENECK HITCH

16,530 LBS

16,410 LBS

15,890 LBS

MAX PAYLOAD

4,365 LBS

4,398 LBS

6,610 LBS


AT4 & DENALI’S HEAVY DUTY CAPABILITY

RESPONSIVE SUSPENSIONS

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

STAY COOL UNDER PRESSURE

  • Dense, cool air from the Dual Path Air Induction System is drawn through the hood scoop and the large grille to help optimize horsepower trailering performance
  • A 28" variable-speed cooling fan helps maintain optimal operating temperatures of the available 6.6L Duramax Turbo-Diesel V8 Engine
  • The factory-installed Diesel After-Run feature helps cool down the engine following heavy usage

STOPPING & GOING POWER 

AVAILABLE AUTO ELECTRIC PARKING BRAKE
  • Assists with positioning after backing up to a trailer hitch using the available Hitch View
  • Automatically applies the electric parking brake upon shifting into Park
  • Helps avoid unintentional rolling
PARK GRADE HOLD ASSIST
  • Helps prevent movement when shifting out of Park on a hill and moving a foot from brake to accelerator pedal ·
  • Automatically applies brakes at each wheel for an extended period while trailering
AVAILABLE DIGITAL VARIABLE STEERING ASSIST
  • Helps ease the driver’s steering effort when maneuvering at low speeds 
  • Reduces the steering effort needed to return the heavy-duty truck to center
  • Adapts to crowned road surfaces, reducing the need to correct steering over long stretches of uneven road
  • Includes enhancements to help with driving response, especially when trailering or when carrying a heavy load
AVAILABLE 2-SPEED AUTOTRAC TRANSFER CASE
  • Provides seamless shifting between two- and four-wheel drive based on road conditions
  • First heavy-duty truck in its class to offer a 2-speed AutoTrac® transfer case with an active automatic 4WD setting
AVAILABLE TRACTION SELECT SYSTEM WITH TOW/HAUL MODE AND OFF-ROAD MODE
  • 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 various 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

KEY FEATURES:

  • Off-Road Suspension
  • Twin-Tube Rancho® Shocks
  • Underbody Skid Plates
  • Eaton® Automatic Locking Rear Differential
GOOSENECK/5TH WHEEL HITCH PACKAGE

KEY FEATURES:

  • Hitch Platform to Accept Gooseneck or Fifth-Wheel Hitch
  • Hitch Platform with Tray to Accept Ball and Stamped Bed Holes with Removable Bed Caps
  • Bed-Mounted 7-pin Trailer Harness
  • Bed View Camera

Due to current supply-chain shortages, certain features shown have limited or late availability, or are no longer available. See the window label or a dealer regarding the features on an individual vehicle.

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