2023 SIERRA
HD AT4

AS SHOWN: $81,065

AS SHOWN: MAX PAYLOAD 3,514 lbs.

AS SHOWN: AVAILABLE MAX TOWING 14,500 lbs.

White Starting At Icon

STARTING AT

$65,600

White Towing Icon

AVAILABLE MAX TOW UP TO

21,130 LBS.

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MAX PAYLOAD UP TO

4,196 LBS.

White Torque Icon

AVAILABLE MAX TORQUE UP TO

910 LB.-FT.

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.

OFF-ROAD WITHOUT COMPROMISE

Built to power you and your trailer off-road, the Sierra HD AT4 Pickup Truck offers available towing up to 21,130 LBS.

AVAILABLE 6.6L DURAMAX® TURBO-DIESEL V8 ENGINE

  • 445 HP and 910 lb.-ft. of torque
  • Large variable-speed cooling fan and dual path air induction system
  • Factory-installed diesel after-run function helps maintain an ideal temperature for performance and efficiency
  • Intelligent diesel exhaust brake system
  • Large rear axle ring gears (11.5" on 2500, 12" on 3500) allow for an all-around mix of engine performance, towing strength and efficiency
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STANDARD 6.6L V8 GAS ENGINE WITH 6-SPEED AUTOMATIC TRANSMISSION

  • 401 HP and 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
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AVAILABLE ALLISON 10-SPEED AUTOMATIC TRANSMISSION

  • First HD in its class to offer Allison 10-speed automatic transmission
  • Optimizes gear shifts for power, torque and efficiency
  • Close gear spacing that allows the engine to operate in an optimal range at all times with varying load and terrain conditions
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HIGH-STRENGTH CHASSIS AND SUSPENSION

  • Chassis and suspension are built upon a fully boxed, ladder-type frame
  • Built from high-strength steel using front hydroformed rails
  • Clamshell design helps provide stability while towing and off-roading
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MADE FOR OFF-ROAD

  • 2-speed AutoTrac® transfer case with an active automatic 4WD drive setting helps provide seamless shifting between two- and four-wheel drive based on road conditions
  • Hill Descent Control
  • Skid plates provide added underbody protection
  • Equipped with Off-Road Mode
  • Off-Road Suspension with Rancho® Shocks
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NEXT-LEVEL GROUND CLEARANCE

  • Assists in clearing rugged terrain
  • Up to 11.18" of ground clearance
  • Maximum approach angle of 27 degrees
     
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EXTERIOR

Sierra HD AT4’s adventurous exterior dominates terrain in style with premium Black Chrome Accents, Side Bed Step, Red Recovery Hooks, available High Clearance Step, and much more.

Sierra HD AT4’s Rugged Exterior

Side Bed Step

Vertical Red Recovery Hooks

WORLD’S FIRST SIX-FUNCTION GMC MULTIPRO TAILGATE

Offers six distinct functions. Designed to help improve loading, unloading and accessing the cargo box.

INTERIOR

PURPOSEFUL ACCOMMODATIONS & ACCENTS

  • Jet Black with Kalahari interior and embroidered AT4 accents
  • Premium front and rear floor liners with removable carpet inserts
  • Available wireless charging pad
  • Heated and ventilated front perforated leather seating surfaces

TECH & SAFETY

UP TO 15 CAMERA VIEWS

Keep tabs on your truck and trailer with up to 15 different available camera views to optimize the view around the truck and compatible trailers, including:

  • HD Surround Vision
  • Rear Top-Down View
  • Rear Camera Mirror
  • Picture-in-Picture Side View
  • Bed View Camera
  • Transparent Trailer View
VIEW ALL TECH & SAFETY FEATURES
AVAILABLE 15" DIAGONAL HEAD-UP DISPLAY

This feature projects key information onto your windshield such as:

  • Speed
  • Available Navigation
  • Forward Collision Alert
  • Lane Departure Warning
  • Cruise Control
  • And More
VIEW ALL TECH & SAFETY FEATURES
PROGRADE™ TRAILERING SYSTEM

This system of intelligent trailering technologies helps streamline the hitching and towing process with integrated tools that help you tow with confidence and control.

  • Available In-Vehicle Trailering App
  • myGMC Mobile App Trailering Features
  • Smart Trailer Integration
VIEW ALL TECH & SAFETY FEATURES
INTELLIGENT SAFETY FEATURES

Help enhance your awareness of the road and surrounding vehicles with the available suite of intelligent safety technologies including:

  • Available Forward Collision Alert (Shown)
  • Available Rear Cross Traffic Alert
  • Available Lane Departure Warning
  • Available Lane Change Alert with Side Blind Zone Alert
VIEW ALL TECH & SAFETY FEATURES
ONSTAR® & GMC CONNECTED SERVICES

Receive three years of the OnStar and Connected Services Premium Plan with your new 2023 Sierra Heavy Duty AT4, including the Connected Vehicle Plan and the OnStar Safety & Security Plan.

  • Connected Vehicle Plan includes connectivity for available In-Vehicle apps, Remote Access Plan and In-Vehicle Wi-Fi Hotspot data.
  • OnStar Safety & Security Plan includes access to the OnStar Guardian App, Automatic Crash Response, Emergency Services, Crisis Assist, Roadside Assistance and Stolen Vehicle Assistance.
VIEW ALL TECH & SAFETY FEATURES

SIERRA AT4 FEATURED PACKAGE

AT4 PREMIUM PLUS PACKAGE

KEY FEATURES:

  • Bose Premium Sound System with Richbass Subwoofer
  • HD Surround Vision with Two Trailer View Camera Provisions
  • Optional Black Power-Retractable Assist Steps with LED Perimeter Lighting
  • AT4 High Clearance Step 
  • Multicolor 15" Diagonal Head-Up Display
  • 20" Machined Aluminum Wheels with High-Gloss Black Accents

SIERRA HD

2500 VS 3500

SIERRA 2500 HD AT4

  • Maximum conventional trailering capacity of up to XX,XXX lbs. (As shown XX,XXX lbs.)
  • Maximum fifth-wheel/gooseneck rating of up to XX,XXX lbs.
  • Maximum payload of up to X,XXX lbs.

SIERRA 3500 HD AT4

  • Maximum conventional trailering capacity of up to XX,XXX lbs. (As shown XX,XXX lbs.)
  • Maximum fifth-wheel/gooseneck rating of up to XX,XXX lbs.
  • Maximum payload of up to X,XXX lbs.

SPEC HIGHLIGHTS

SIERRA HD AT4

2500 HD AT4

GMC Sierra 2500 HD AT4 Pickup Truck comes in a 4WD Crew Cab with a 6' 9" standard box or available 8' long box.

MAX CONVENTIONAL
TRAILERING

18,500 LBS.

MAX GCWR

27,500 LBS.

WHEELBASE

158.94 – 172.0 IN.

FRONT/REAR TREAD WIDTH

SINGLE REAR WHEEL: 68.17 / 38.35 IN.

MAX FIFTH-WHEEL/
GOOSENECK RATING

18,500 LBS.

GROUND CLEARANCE

11.14 – 11.18 IN.

CARGO VOLUME

69.5 – 83.5 CU.FT.

3500 HD AT4

GMC Sierra 3500 HD AT4 Pickup Truck comes in a 4WD Crew Cab with a 6' 9" standard box or available 8' long box. Single Rear Wheel only.

MAX CONVENTIONAL
TRAILERING

20,000 LBS.

MAX GCWR

29,700 LBS.

WHEELBASE

158.94 – 172.00 IN.

FRONT/REAR TREAD WIDTH

SINGLE REAR WHEEL: 68.17 – 68.35 IN.

MAX FIFTH-WHEEL/
GOOSENECK RATING

21,130 LBS.

GROUND CLEARANCE

11.14 – 11.14 IN.

CARGO VOLUME

69.5 – 83.5 CU.FT.

DETAILED SPECS

SIERRA AT4 2500 & 3500 

COLORS

EXTERIOR
Summit White

Summit White

Ebony Twilight Metallic

Ebony Twilight Metallic

Cayenne Red Tintcoat

Cayenne Red Tintcoat

Pacific Blue Metallic

Pacific Blue Metallic

Forest Metallic

Forest Metallic

Onyx Black

Onyx Black

INTERIOR
Jet Black with Kalahari Accents

Jet Black with Kalahari Accents

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