Vehicle Details
Body Style
Truck
Engine
6.6L 8Cyl
Exterior Colour
Tan
Interior Colour
Black
Transmission
Automatic
Drivetrain
4×4
Stock
303452
Fuel Type
Diesel
Trim Details
Crew Cab Standard Box 4-Wheel Drive AT4X
Description
The 2026 GMC Sierra 2500HD AT4X Crew Cab blends extreme off-road capability, heavy-duty strength, and premium craftsmanship into a commanding pickup built for those who demand more. With its rugged AT4X design, advanced trailering tech, and refined interior, this truck is equally at home on remote trails or at the job site.Â
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Performance & CapabilityÂ
Engine: Duramax® 6.6L V8 Turbo-Diesel delivering exceptional torque and heavy-duty pulling powerÂ
Transmission: Allison® 10-speed automatic for smooth, confident shifting under loadÂ
Drivetrain: Autotrac® 4-Wheel Drive with two-speed transfer case for adaptable tractionÂ
Axle Ratio: 3.42 rear axle optimized for towing strength and highway efficiencyÂ
Off-Road Suspension: AT4X-tuned suspension engineered for durability, articulation, and controlÂ
Electronic Rear Locking Differential for maximum traction in challenging terrainÂ
Hill Descent Control for confident downhill drivingÂ
Exhaust Brake and heavy-duty cooling systems for enhanced control while towingÂ
Trailering Capability: Integrated trailer brake controller, hitch guidance with Hitch View, and advanced trailering appÂ
Gooseneck/5th Wheel Prep Package for serious towing versatilityÂ
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AT4X Off-Road Presence & DesignÂ
18" Aluminum Wheels wrapped in aggressive mud-terrain tires for uncompromising gripÂ
Bold AT4X styling with darkened accents and signature badgingÂ
Front Red Recovery Hooks for added confidence in off-road situationsÂ
LED Headlamps, Fog Lamps, and Roof Marker Lamps for enhanced visibility in all conditionsÂ
Spray-On Bedliner for long-lasting durability and cargo protectionÂ
GMC MultiPro Tailgate with multiple configurations for loading and workspace versatilityÂ
Power-Retractable Assist Steps with LED lighting for easy access in any environmentÂ
Bed Lighting and 120V Bed-Mounted Power Outlet for jobsite functionalityÂ
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Interior Comfort & Premium FeaturesÂ
Jet Black / Ceramic White interior with upscale materials and AT4X-exclusive detailingÂ
Front Bucket Seats with power adjust, lumbar support, and driver memory settingsÂ
Heated & Ventilated Front Seats plus Heated Rear Outboard Seats for year-round comfortÂ
Front Seat Massage Function for long-haul driving relaxationÂ
Heated Steering Wheel and dual-zone automatic climate controlÂ
Power Sunroof bringing open-air freedom to every driveÂ
Premium Floor Liners with removable carpet inserts for durability and easy cleaningÂ
Power Sliding Rear Window and Rear Seat Storage Package for added practicalityÂ
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Technology & ConnectivityÂ
13.4" GMC Premium Infotainment Touchscreen with Google Built-In and NavigationÂ
12" Digital Driver Information Centre with customizable displaysÂ
Head-Up Display projecting key driving data onto the windshieldÂ
Wireless Apple CarPlay® & Android Autoâ„¢ for seamless smartphone integrationÂ
Bose® Premium Sound System for rich, immersive audioÂ
Wireless Charging Pad and multiple USB ports throughout the cabinÂ
Wi-Fi® Hotspot capability and connected services for productivity on the goÂ
MultiPro Tailgate Audio System for entertainment wherever you areÂ
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Safety & Driver AssistanceÂ
GMC Pro Safety Package designed for confidence on and off the roadÂ
Forward Collision Alert with Automatic Emergency BrakingÂ
Lane Departure Warning and Following Distance IndicatorÂ
Front & Rear Park Assist for easier maneuvering in tight spacesÂ
HD Surround Vision and Bed View Camera for enhanced visibility while traileringÂ
Trailer Side Blind Zone Alert for safer lane changes when towingÂ
Rear Cross Traffic Alert and Front Pedestrian BrakingÂ
Adaptive Cruise Control for relaxed highway drivingÂ
Safety Alert Seat providing intuitive directional warningsÂ
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Utility & Everyday FunctionalityÂ
Keyless Open & Push-Button Start for convenience and easeÂ
Remote Start System for pre-conditioning the cabinÂ
Universal Home Remote for garage and property accessÂ
Deep-Tinted Glass for privacy and UV protectionÂ
Rear Wheelhouse Liners and winter grille cover for all-season durabilityÂ
Multiple power outlets including 120V in-cabin and in-bed for tools and devicesÂ
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Whether you're hauling heavy loads, conquering off-road terrain, or traveling in comfort, the 2026 GMC Sierra 2500HD AT4X delivers unmatched capability with premium refinement. It’s the ultimate fusion of rugged strength, advanced technology, and elevated design, built for those who push beyond the pavement without compromise.Â
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Packages & Options
Standard Equipment
Technical Specifications
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AM/FM Stereo
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Auxiliary Audio Input
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Bluetooth Connection
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MP3 Player
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Navigation System
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Smart Device Integration
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Requires Subscription
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Satellite Radio
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Premium Sound System
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WiFi Hotspot
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Aluminum Wheels
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Tires - Front All-Season
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Tires - Rear All-Season
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Conventional Spare Tire
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Generic Sun/Moonroof
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Sun/Moonroof
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Bumper, front, body-colour lower (Bumper color will be High Gloss Black.)
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Bumper, rear body-colour with bumper CornerSteps (Bumper color will be High Gloss Black.)
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Power Retractable Running Boards
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Running Boards/Side Steps
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Bed Liner
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Bed Step, Black integrated on forward portion of bed on driver and passenger side
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CornerStep, rear bumper (Not available with (ULV) AT4X AEV Edition.)
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Cargo tie downs (12), fixed, rated at 500 lbs (226.8 kg) per corner
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Wheelhouse liners, rear
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Mouldings, beltline, Black
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Grille (Gloss Black header and grille insert bars with Dark Nickel inserts.)
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Daytime Running Lights
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Automatic Highbeams
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Fog Lamps
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Lamps, cargo area cab mounted integrated with centre high mount stop lamp, with switch in bank on left side of steering wheel
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LED Cargo Area Lighting located in cargo bed activated with switch on centre switch bank or key fob
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Taillamps, Animated LED Signature Tail, Stop, turn and Reverse lamps
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Lamps, Smoked Amber roof marker, (LED)
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Heated Mirrors
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Integrated Turn Signal Mirrors
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Power Folding Mirrors
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Power Mirror(s)
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Mirror caps, high gloss Black
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Privacy Glass
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Intermittent Wipers
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Rain Sensing Wipers
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Variable Speed Intermittent Wipers
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Door handles, body-colour (With (ULV) AT4X AEV Edition door handles will be Gloss black.)
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Integrated Tailgate Step
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Tailgate, gate function manual with EZ Lift includes power lock and release, includes hitch area light
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Tailgate and bed rail protection caps, top
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Bucket Seats
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Leather Seats
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Pass-Through Rear Seat
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Rear Bench Seat
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Driver Adjustable Lumbar
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Power Driver Seat
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Seat-Massage
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Passenger Adjustable Lumbar
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Power Passenger Seat
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Heated Front Seat(s)
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Cooled Front Seat(s)
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Heated Rear Seat(s)
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Mirror Memory
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Seat Memory
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Floor covering, colour-keyed carpeting
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Floor Mats
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Leather Steering Wheel
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Heated Steering Wheel
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Steering Wheel Audio Controls
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Adjustable Steering Wheel
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Driver Information Centre, enhanced, 12.3" diagonal reconfigurable multicolour digital display
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Heads-Up Display
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Rear Seat Reminder
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GMC Premium information Display- 13.4" diagonal Multicolour touch screen
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Exterior Temperature Display, located in radio display
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Compass, located in instrument cluster
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Power Windows
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Rear Defrost
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Sliding Rear Window
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Power Door Locks
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Keyless Entry
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Keyless Start
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Remote Engine Start
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Adaptive Cruise Control
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Cruise Control
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Universal Garage Door Opener
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Wireless Charging
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Security System
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Power outlet, instrument panel, 120-volt (400 watts shared with (KC9) bed mounted power outlet)
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Auxiliary Audio Input
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MP3 Player
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USB ports, (2) charge-only, rear
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Air vents, rear
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A/C
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Climate Control
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Multi-Zone A/C
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Auto-Dimming Rearview Mirror
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Back-Up Camera
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Assist handles front A-pillar mounted for driver and passenger, rear B-pillar mounted
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8 Cylinder Engine
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Gasoline Fuel
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10-Speed A/T
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A/T
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Rear axle, 3.73 ratio (Requires (L8T) 6.6L V8 gas engine.)
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Running Boards/Side Steps
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GVWR, 11,025 lbs. (5001 kg) (Included and only available with TK20743 model and (L8T) 6.6L V8 gas engine with 18", 20" or 22" wheels.)
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Keyless Start
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Hill Descent Control
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Transfer case, two-speed active, electronic Autotrac with push button control
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Locking/Limited Slip Differential
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Four Wheel Drive
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Cooling, external engine oil cooler
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Cooling, auxiliary external transmission oil cooler
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Air filter, heavy-duty
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Air filtration monitoring
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Battery, heavy-duty 720 cold-cranking amps/80 Amp-hr maintenance-free with rundown protection and retained accessory power (Included and only available with (L8T) 6.6L V8 gas engine.)
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Alternator, 170 amps (Requires (L8T) 6.6L V8 gas engine.)
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Trailer brake controller, integrated
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In-Vehicle Trailering App, System includes checklist, trailer maintenance reminders, trailer security alerts, trailer mileage, tow/haul reminder, trailer electrical diagnostics and Trailer Tire Pressure Monitor System module (Includes trailer tire pressure monitoring alert when (PTT) trailer tire pressure monitor sensors are installed.)
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Tow Hooks
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Skid Plates, front aluminum
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Skid Plates, Transfer case, steel
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Frame, fully-boxed, hydroformed front section and a fully-boxed stamped rear section
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Suspension, Off-Road Includes, 1.5" suspension lift: front suspension lift composed of: Control Arms, Ball Joints, Knuckles, DSSV Dampers, rear suspension lift composed of spacer block and DSSV Dampers and Half shafts w/ revised joints, 3-stage Leaf springs from 3500
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Power Steering
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4-Wheel Disc Brakes
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ABS
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Brake lining wear indicator
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Capless Fuel Fill (Requires (L8T) 6.6L gas V8 engine.)
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Automatic Highbeams
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Front Collision Mitigation
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Front Collision Warning
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Lane Departure Warning
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Tow Hitch
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ProGrade Trailering System includes (PZ8) Hitch Guidance with Hitch View and (UET) In-vehicle Trailering App
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Front Collision Mitigation
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Front Collision Warning
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Stability Control
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Traction Control
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Daytime Running Lights
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Driver Air Bag
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Front Head Air Bag
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Front Side Air Bag
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Passenger Air Bag
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Passenger Air Bag Sensor
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Rear Head Air Bag
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Requires Subscription
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Telematics
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Rear Parking Aid
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Aerial View Display System
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Back-Up Camera
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Bed View Camera, camera in the CHMSL to show a view of the cargo bed display located in infotainment screen, includes Two Trailer Camera Provisions
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Trailer Camera Provisions and trailer viewing software
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Hitch Guidance dynamic single line to aid in truck trailer alignment for hitching
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Lane Departure Warning
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Rear Seat Belt Indicator
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Cross-Traffic Alert
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Blind Spot Monitor
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Seat Belt Adjustable Guide Loops, front row only
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Buckle to Drive prevents vehicle from being shifted out of Park until driver seat belt is fastened; times out after 20 seconds and encourages seat belt use (Included and only available with (PDI) Sierra HD Pro Safety.)
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Safety Alert Seat
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Driver Restriction Features
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Tire Pressure Monitor
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Trailer Tire Pressure Monitor Sensors includes set of 4 sensors. Sensor functionality requires (UET) In-Vehicle Trailering App to be ordered with the vehicle and installed by the factory. Sensors will be shipped loose with the truck and will need to be installed on trailer by customer. System is capable of monitoring up to 6 wheels. Additional or replacement sensors are available through GM Accessories
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Trailering Information Label provides max trailer ratings for tongue weight, conventional, gooseneck and 5th wheel trailering
No matches were found.
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Vehicle NameGMC Sierra 2500HD
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Body StyleCrew Cab Pickup
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Body CodeE63
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DrivetrainFour Wheel Drive
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Trans Order CodeMGM
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Trans Type10
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Trans Description Cont.Automatic
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First Gear Ratio (:1)4.54
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Second Gear Ratio (:1)2.87
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Third Gear Ratio (:1)2.06
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Fourth Gear Ratio (:1)1.72
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Fifth Gear Ratio (:1)1.48
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Sixth Gear Ratio (:1)1.26
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Seventh Gear Ratio (:1)1.00
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Eighth Gear Ratio (:1)0.85
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Ninth Gear Ratio (:1)0.69
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Tenth Gear Ratio (:1)0.63
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Reverse Ratio (:1)4.54
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Transfer Case Gear Ratio (:1), High1
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Passenger Capacity5
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Front Head Room (in)39.88
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Front Leg Room (in)44.53
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Front Shoulder Room (in)66.02
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Front Hip Room (in)61.18
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Second Head Room (in)40.12
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Second Leg Room (in)43.4
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Second Shoulder Room (in)65.3
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Second Hip Room (in)60.24
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Gross Axle Wt Rating - Front (lbs)5600
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Gross Axle Wt Rating - Rear (lbs)6600
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Curb Weight - Front (lbs)4013
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Curb Weight - Rear (lbs)2812
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Gross Vehicle Weight Rating Cap (lbs)11350
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Gross Combined Wt Rating (lbs)27500
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Dead Weight Hitch - Max Trailer Wt. (lbs)5000
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Dead Weight Hitch - Max Tongue Wt. (lbs)500
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Wt Distributing Hitch - Max Trailer Wt. (lbs)18500
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Wt Distributing Hitch - Max Tongue Wt. (lbs)1850
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Fifth Wheel Hitch - Max Trailer Wt. (lbs)17300
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Fifth Wheel Hitch - Max Tongue Wt. (lbs)4325
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Maximum Trailering Capacity (lbs)18500
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Engine Order CodeL5P
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Engine TypeTurbocharged Diesel V8
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Displacement6.6L
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Fuel SystemDirect Injection
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SAE Net Horsepower @ RPM470 @ 2800
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SAE Net Torque @ RPM975 @ 1600
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Engine Oil CoolerYes
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Cold Cranking Amps @ 0° F (Primary)720
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Maximum Alternator Capacity (amps)220
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Frame TypeBox Ladder
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Suspension Type - FrontTorsion Bar
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Suspension Type - Rear3-Stage Multi-Leaf
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Axle Ratio (:1) - Front3.42
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Axle Ratio (:1) - Rear3.42
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Shock Absorber Diameter - Front (mm)55
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Shock Absorber Diameter - Rear (mm)51
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Stabilizer Bar Diameter - Front (in)1.38
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Front Tire Order CodeQMG
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Rear Tire Order CodeQMG
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Spare Tire Order CodeQNZ
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Front Tire SizeLT305/70R18
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Rear Tire SizeLT305/70R18
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Spare Tire SizeLT305/70R18
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Front Wheel Size (in)18
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Rear Wheel Size (in)18
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Spare Wheel Size (in)18
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Front Wheel MaterialAluminum
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Rear Wheel MaterialAluminum
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Steering TypePwr Recirculating Ball
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Turning Diameter - Curb to Curb (ft)51.8
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Brake TypePwr
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Brake ABS System4-Wheel
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Disc - FrontYes
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Disc - RearYes
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Front Brake Rotor Diam x Thickness (in)14 x 1.6
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Rear Brake Rotor Diam x Thickness (in)14.1 x 1.3
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Fuel Tank Capacity, Approx (L)136
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Wheelbase (in)159
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Length, Overall (in)250.75
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Width, Max w/o mirrors (in)81.85
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Height, Overall (in)82.68
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Cab to Axle (in)42.36
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Ground Clearance, Front (in)11.61
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Ground Clearance, Rear (in)11.61
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Cargo Box Length @ Floor (in)82.2
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Cargo Box Width @ Floor (in)71.4
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Cargo Box Width @ Wheelhousings (in)51.85
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Cargo Box (Area) Height (in)21
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Cargo Volume (ft³)69.5
No matches were found.
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