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.
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
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
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
TOWING AND PAYLOAD TABLES
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
- 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
- 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
- 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
- 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
- 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
KEY FEATURES:
- Off-Road Suspension
- Twin-Tube Rancho® Shocks
- Underbody Skid Plates
- Eaton® Automatic Locking Rear Differential
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.
