OVERVIEW PRO, SLE & SLT AT4 & AT4X DENALI & DENALI ULTIMATE COMPARE TRIMS BUILD & PRICE

2025

2026

2026 GMC SIERRA HEAVY DUTY

AT4 & AT4X

HEAVY-DUTY OFF-ROAD TRUCKS

AS CONFIGURED: {{as_shown_price}}{{as_shown_price_disclosure}}
Front-side view of the 2026 GMC Sierra HD AT4 driving alone on a dirt path.

Vehicles shown throughout with an accessory(ies) from an independent supplier, which are not warranted by GM or its dealers. GM is not responsible for the safety or quality of independent supplier accessories. Any warranty is provided by the accessory manufacturer.
BUILD & PRICE VIEW INVENTORY

AT4 STARTING AT :

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AVAILABLE TOW UP TO

9,662 KG* (21,300 LB* )

KEY FEATURES

EXCLUSIVE ON AT4X

FACTORY-INSTALLED 1.5" SUSPENSION LIFT

EXCLUSIVE ON AT4X

MULTIMATIC® DSSV DAMPERS 

STANDARD ON AT4

OFF-ROAD SUSPENSION WITH RANCHO® SHOCKS

EXCLUSIVE ON AT4X

35" GOODYEAR® TERRITORY MT TIRES

EXCLUSIVE ON AT4X

OBSIDIAN RUSH INTERIOR WITH FULL-GRAIN LEATHER SEATING

STANDARD ON AT4 & AT4X

13.4" DIAGONAL TOUCHSCREEN

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EXPLORE GMC SIERRA HD AT4 & AT4X TRIMS

Front-side view of the 2026 GMC Sierra HD AT4.

AS CONFIGURED: {{as_shown_price}}{{as_shown_price_disclosure}}

AT4

STARTING AT:

{{starting_price}}{{starting_price_disclosure}}

AVAILABLE TOW UP TO

21,300 LBS.*

KEY STANDARD FEATURES
  • Exclusive Jet Black interior with Kalahari accents, and heated and ventilated perforated front leather seating surfaces
  • Exclusive 20" gloss-black aluminum wheels with available BFGoodrich® off-road tires
  • Off-Road Suspension Package with twin-tube Rancho shocks and skid plates
  • High Definition Surround Vision*
  • Adaptive Cruise Control*

KEY AVAILABLE FEATURES*
  • 15" diagonal Head-Up Display* with off-road inclinometer
  • Up to 14 camera views,* including transparent trailer view*
BUILD & PRICE VIEW INVENTORY VIEW INVENTORY VIEW INVENTORY
Front-side view of the 2026 GMC Sierra HD AT4X.

AS CONFIGURED: {{as_shown_price}}{{as_shown_price_disclosure}}

AT4X*

STARTING AT:

{{starting_price}}{{starting_price_disclosure}}

AVAILABLE TOW UP TO

18,500 LBS.*

KEY STANDARD FEATURES
  • Factory-installed 1.5" suspension lift, Multimatic® DSSV dampers, rear electronic-locking differential, larger steel transfer case skid plate and front aluminum skid plate
  • 35" MT tires
  • 16-way heated and ventilated power front seats with massage feature
  • Obsidian Rush interior featuring full-grain leather seating with technical-grain leather accents and authentic Vanta ash wood

KEY AVAILABLE FEATURES*
  • AT4X AEV Edition featuring stamped steel bumpers, steering gear and transfer case skid plates, and 18" Salta gloss-black wheels
  • AEV embroidered front headrests 
  • Duramax 6.6L Turbo-Diesel V8 engine with 10-speed automatic transmission
BUILD & PRICE  VIEW INVENTORY VIEW INVENTORY VIEW INVENTORY

SIERRA HD AT4 & AT4X COLOURS

Use the tabs to view available trims, exterior and interior colours, and wheels.

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BUILD & BUY

SIERRA HD AT4X AEV EDITION

Equipped by off-road recreational driving and overland adventure travel experts American Expedition Vehicles (AEV®), this off-road pickup is engineered for the roughest terrain.
my26-sierra-hd-at4x-aev-header-1280x960-26PGSRHD91424.jpg
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AEV STAMPED-STEEL BUMPERS

AEV heavy-duty, stamped-steel, powder-coated front and rear bumpers offer added protection while summiting boulders and rough terrain.
my26-sierra-hd-at4x-aev-stamped steel skid-plate-1280x640-26PGSRHD99061.jpg

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STAMPED-STEEL SKID PLATES

Rugged underbody protection with stamped-steel skid plates helps keep vital components such as the steering gear and the transfer case protected from ruts, rocks, stumps and other challenges of the trail.
my26-sierra-hd-at4x-aev-18-inch-salta-wheels-1280x640-26PGSRHD91422.jpg

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AEV 18" SALTA® WHEELS

AEV racing-inspired Salta wheels with a 16-spoke design add to the AEV Edition’s rugged good looks.
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AEV EMBROIDERED FRONT HEAD RESTRAINTS

The heavy-duty off-road truck is accented with exclusive AEV embroidered badging on the front head restraints.

VIEW DETAILS

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AT4X VS. AT4X AEV

my26-sierra-hd-at4x-aev-compare-1280x640-25PGSRHD91456.jpg

AT4X

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AT4X AEV

GROUND CLEARANCE

294 mm (11.6")

299 mm (11.8")

APPROACH ANGLE

31.6°

29.8°

BREAKOVER ANGLE

21.2°

22.6°

DEPARTURE ANGLE

25.7°

25.7°

BUILD & PRICE

CAPABILITY

Adventure-ready hardware meets impressive power.

Wide Front Three-Quarters View of a 2026 GMC Sierra HD AT4 Truck Driving Through the Mountains.
Front Three-Quarters View of a White 2026 GMC Sierra HD AT4 Truck Driving Through the Mountains Kicking Up Dirt

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DURAMAX 6.6L TURBO-DIESEL V8 ENGINE

The Sierra Heavy Duty off-road truck’s available Duramax 6.6L Turbo-Diesel V8 engine features an efficient turbocharger and 10-speed automatic transmission.

VIEW DETAILS

The 2026 GMC Sierra HD Heavy Duty AT4 Truck Hauling a RV Through a Dirt Road.

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AT4 OFF-ROAD READINESS

The AT4 off-road work truck features an off-road suspension with twin-tube Rancho shocks, skid plates and Hill Descent Control, which uses antilock braking to help you maintain control.
Wide Front Three-Quarters View of a 2026 GMC Sierra HD AT4 Truck Driving Through the Mountains.

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AT4X OFF-ROAD PROWESS

The AT4X off-road truck is prepared for the challenges of the trail with ground clearance of 295 mm (11.6 inches), an approach angle of 31.6 degrees and a 25.7 degree departure angle.
Close-up of Multimatic DSSV Dampers on the 2026 GMC Sierra HD AT4.

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MULTIMATIC DSSV DAMPERS

Available AT4X-exclusive Multimatic DSSV dampers are high-performance shock absorbers that can provide superior balance for comfort and handling in rugged off-road situations.
Close-up of the Rear Electronic-locking Differential on the 2026 GMC Sierra HD AT4.

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REAR ELECTRONIC-LOCKING DIFFERENTIAL

Tackle tough terrain with a rear electronic-locking differential on AT4X, which assures both wheels will spin together to help keep traction in off-road situations where one wheel is off the ground or on a low-traction surface.
Trailering View Guide Direct Rear Camera View in a 2026 GMC Sierra HD AT4.

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PROGRADE® TRAILERING TECH

This advanced suite of available intelligent technologies helps streamline the hitching and towing process with integrated tools that help enhance your sense of confidence and visibility.

VIEW DETAILS

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EXTERIOR

Boldly designed and ruggedly equipped.

A 2026 GMC Sierra HD AT4 Truck Hauling a Trailer Through the Desert at Dusk.
Close-up of the 2026 GMC Sierra HD AT4X Grille.

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AT4 GRILLE

Stand out with AT4’s bold front-facing exterior design and LED projector headlamps with animated sequences.
Rear Three-quarter View of a 2026 GMC Sierra HD AT4 Off-Road Truck.

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AT4X EXTERIOR

Available 35" Goodyear Territory MT tires and a factory-installed 1.5" suspension lift on Sierra HD AT4X and AT4X AEV Edition provide serious traction and clearance.
Close-up View of the AT4 HD Badging and Wheel on a 2026 GMC Sierra HD AT.

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20" AT4 WHEELS

Sierra HD AT4’s 20" high gloss-black aluminum wheels with available BFGoodrich off-road tires are made for rough trails.
Close-up View of the Truck Bed on a 2026 GMC Sierra HD AT4.

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SPRAY-ON BEDLINER

Help protect the bed and enhance its style with durable cargo bed protection featuring a GMC logo. 
Close-up View of the Step on a 2026 GMC Sierra HD AT4.

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POWER-RETRACTABLE ASSIST STEPS

This available feature includes LED lighting to help illuminate the way as you enter or exit.
Close-up View of the MultiPro Tailgate with Step Lowered on a 2026 GMC Sierra HD AT4.

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SIX-FUNCTION MULTIPRO™ TAILGATE

The world’s first MultiPro Tailgate combines six convenient functions that help improve loading, unloading and accessing the cargo bed.

VIEW DETAILS

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INTERIOR

Take on the world in comfort and control.

AT4 with Kalahari interior and leather seating surfaces.
Interior View of Front Seats in a 2026 GMC Sierra HD AT4.

AT4X featuring red and white double-needle stitching.
Interior View of Front Seats in a 2026 Sierra HD AT4.
Interior View of Front Seats and the Dashboard in a 2026 GMC Sierra HD AT4.

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AT4 INTERIOR

AT4’s Jet Black interior with Kalahari accents features heated and ventilated front seats with perforated leather seating surfaces, and a wrapped heated steering wheel.
Interior View of Front Seats and the Dashboard in a 2026 GMC Sierra HD AT4.

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AT4X-EXCLUSIVE OBSIDIAN RUSH INTERIOR

AT4X’s interior features authentic Vanta Ash wood, and seats include bold red and white double-needle stitching for athletic character.
Close-up View of the Seat Controls in a 2026 GMC Sierra HD AT4.

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POWER FRONT SEATS WITH MASSAGING FEATURE

Experience serious comfort in Sierra HD AT4X’s 16-way power front seats with massaging feature.
Close-up View of the AT4X Branded Kickplate in a 2026 GMC Sierra HD AT4 Truck.

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PREMIUM ALL-WEATHER FLOOR LINERS

Help protect your interior with available floor liners with removable carpet inserts.
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TECHNOLOGY

Keep informed and in command.
Wide View of the Dashboard, Infotainment System, and Steering Wheel in a 2026 GMC Sierra HD AT4 Truck.
Close-up of the 13.4 Inch Diagonal Premium GMC Infotainment System of the 2026 GMC Sierra HD AT4.

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13.4" DIAGONAL PREMIUM GMC INFOTAINMENT SYSTEM*

The colour touchscreen with Google built-in* compatibility and voice-activated technology for your phone provides a seamless way to customize your entertainment.
Close-up of the 12.3 Inch Diagonal Color Driver Infotainment Center of the 2026 GMC Sierra HD AT4.

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12.3" DIAGONAL COLOUR DRIVER INFORMATION CENTRE

Sierra HD features a driver-focused display that puts information front, centre and easily visible in high-resolution clarity.
Close-up View of the Heads Up Display Feature in Use in a 2026 GMC Sierra HD AT4.

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15" DIAGONAL MULTICOLOUR HEAD-UP DISPLAY

The available 15" diagonal Head-Up Display* helps keep important information like speed and alerts in clear view.

VIEW DETAILS

Close-up of the 13.4 Inch Diagonal Premium GMC Infotainment System of the 2026 GMC Sierra HD AT4.

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UP TO 14 CAMERA VIEWS

Get help seeing around your heavy duty off-road truck and compatible trailer with up to 14 available camera views,* including the industry-first available transparent trailer view.*

VIEW DETAILS

Close-up View of the Infotainment System with Apple Carplay in Use in a 2026 GMC Sierra HD AT4.

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WIRELESS COMPATIBILITY

Connect your compatible smartphone to access a more integrated in-vehicle experience with Apple CarPlay®* or Android Auto™* compatibility.
Close-up of the OnStar Basics Button inside the 2026 GMC Sierra HD AT4.

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ONSTAR® BASICS*

Drive confidently with core OnStar features, including remote commands,* Automatic Crash Response* and more to help you if you’re in need.

VIEW DETAILS

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SAFETY AND DRIVER ASSISTANCE 

Go forth with added confidence.

2026 GMC Sierra HD AT4 Pulling a Trailer Down a Dirt Road Lined with Pine Trees.

SIERRA HD PRO SAFETY*

Every GMC Sierra 2500 HD and GMC Sierra 3500 HD truck includes safety and driver assistance technologies that help while driving and trailering.

VIEW DETAILS

SPEC HIGHLIGHTS
  • 2500 HD AT4
  • 3500 HD AT4
  • 2500 HD AT4X
2026 GMC Sierra 2500 HD AT4.

The Sierra 2500 HD AT4 off-road work truck comes in a 4WD Crew Cab model with a 6' 9" standard bed or an available 8' long bed.

MAX AVAILABLE GOOSENECK/FIFTH-WHEEL TRAILERING RATING

9,612 kg*  (21,190 lb)*

MAX AVAILABLE CONVENTIONAL TRAILERING

9,072 kg* (20,000 lb)*

MAX AVAILABLE GCWR

13,608 kg* (30,000 lb)*

GROUND CLEARANCE

257mm (10.1")

WHEELBASE

4037 mm – 4369 mm (159.0"–172.0")

CARGO VOLUME

1968 - 2364 L* (69.5–83.5 cu. ft.*)

OVERALL VEHICLE LENGTH

6369 mm – 6776 mm (250.8"–266.8")

MAX AVAILABLE PAYLOAD

1,598 kg* (3,524 lb).*
COMPARE TRIMS
2026 GMC Sierra 3500 HD AT4.

The Sierra 3500 Heavy Duty off-road truck comes in a 4WD Crew Cab model with a 6' 9" standard bed or an available 8' long bed. Single Rear Wheel only.

MAX AVAILABLE GOOSENECK/FIFTH-WHEEL TRAILERING RATING

9,662 kg* (21,300 lb).*

MAX AVAILABLE CONVENTIONAL TRAILERING

9,072 kg* (20,000 lb)*

MAX AVAILABLE GCWR

13,608 kg* (30,000 lb)*

GROUND CLEARANCE

283 - 284 mm (11.1"–11.2") 

WHEELBASE

4037 mm - 4369 mm (159.0"–172.0")

CARGO VOLUME

1968 - 2364 L* (69.5–83.5 cu. ft.*)

OVERALL VEHICLE LENGTH 

 

6369 mm - 6776 mm (250.8"–266.8")

MAX AVAILABLE PAYLOAD

1.871 kg* (4,127 lb)*
COMPARE TRIMS
2026 GMC Sierra 2500 HD AT4X.

The Sierra 2500 HD AT4X off-road truck comes in a 4WD Crew Cab model with a 6' 9" standard bed.

MAX AVAILABLE GOOSENECK/FIFTH-WHEEL TRAILERING RATING

8,165 kg* (18,000 lb)*

MAX AVAILABLE CONVENTIONAL TRAILERING

8,392 kg* (18,500 lb)*

MAX AVAILABLE GCWR

12,474 kg*  (27,500 lb* )

GROUND CLEARANCE

295 mm - 299mm (11.6" – 11.8’’)

WHEELBASE

4037 mm (159.0")

CARGO VOLUME

1968 L (69.5 cu. ft.*)

OVERALL VEHICLE LENGTH

6369 - 6401 mm (250.8"–252.0")

MAX AVAILABLE PAYLOAD

1,499 kg* (3,304 lb*)
COMPARE TRIMS

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Asset 14

LOCATE A DEALER

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