Vehicle Details
Body Style
Truck
Engine
6.6L 8Cyl
Exterior Colour
White
Interior Colour
Black
Transmission
Automatic
Drivetrain
4×4
Stock
303874
Fuel Type
Diesel
Trim Details
Crew Cab Standard Box 4-Wheel Drive AT4X
Description
The 2026 GMC Sierra 2500HD AT4X combines heavy-duty capability, premium craftsmanship, and uncompromising off-road performance into one exceptionally refined pickup. Built for drivers who demand serious towing strength, luxury-level comfort, and trail-ready confidence, the AT4X stands at the top of the Sierra HD lineup with bold styling, advanced technology, and rugged capability designed to conquer any challenge. Â
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Performance & CapabilityÂ
Engine: Duramax® 6.6L Turbo-Diesel V8 delivering exceptional torque, towing confidence, and long-haul durability Â
Transmission: Allison®-inspired 10-speed automatic transmission engineered for smooth power delivery and heavy-duty performance Â
Drivetrain: Advanced 4-Wheel Drive (4WD) system with Autotrac® two-speed transfer case for maximum traction Â
Rear Axle Ratio: 3.42 rear axle optimized for towing capability and efficient power management Â
Off-Road Suspension: AT4X-specific suspension package engineered for demanding terrain and superior control Â
Front & Rear Locking Differentials for enhanced traction when tackling mud, rocks, snow, or steep trails Â
Hill Descent Control for confident control on challenging downhill grades Â
Heavy-Duty Cooling Systems including engine oil cooler, transmission oil cooler, and exhaust brake Â
Gooseneck/5th Wheel Prep Package ready for serious towing applications Â
Integrated Trailer Brake Controller and comprehensive trailering technologies Â
Hitch Guidance with Hitch View for simplified trailer connections Â
Trailer Tire Pressure Monitoring and Trailer Camera Provisions for added towing confidence Â
MultiPro Tailgate with EZ Lift power lock and release functionality for enhanced versatility Â
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Winter & Weather ComfortÂ
Heated & Ventilated Front Seats providing year-round comfort Â
Heated Rear Outboard Seats for second-row passenger convenience Â
Heated Steering Wheel for cold-weather driving comfort Â
Remote Vehicle Start System to warm or cool the cabin before departure Â
Dual-Zone Automatic Climate Control for personalized comfort settings Â
Engine Block Heater for dependable cold-weather starts Â
Winter Grille Cover designed to help maintain optimal engine temperatures in harsh conditions Â
Rain-Sensing Windshield Wipers that automatically adapt to changing weather conditions Â
Deep-Tinted Glass helping reduce heat and glare while enhancing privacy Â
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Interior Comfort & ConvenienceÂ
Premium Front Bucket Seats with power driver and passenger adjustments Â
Driver & Front Passenger Massage Seats delivering luxury-level comfort on long journeys Â
Memory Settings for driver seating and mirror positions Â
Power Lumbar Support and Power Adjustable Seat Bolsters for personalized comfort Â
Leather-Wrapped Steering Wheel with integrated audio controls Â
Power Sliding Rear Window for added ventilation and convenience Â
Wireless Charging Pad for effortless device charging Â
Multiple USB Ports throughout the cabin for passenger connectivity Â
Push-Button Start and Keyless Open for seamless daily operation Â
Universal Home Remote for garage and gate control Â
Rear Seat Storage Package providing practical organization solutions Â
Premium Floor Liners with removable carpet inserts for durability and easy cleaningÂ
Power Sunroof bringing additional light and openness to the cabin Â
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Technology & ConnectivityÂ
GMC Premium Infotainment System featuring a massive 13.4-inch touchscreen display Â
Google Built-In integration with intuitive navigation and connected services Â
Wireless Apple CarPlay® and Android Autoâ„¢ compatibility Â
12-inch Reconfigurable Digital Driver Information Display Â
Head-Up Display (HUD) projecting key information directly into the driver's line of sight Â
Bose® Premium Audio System delivering rich, immersive sound quality Â
SiriusXM® capability and available Wi-Fi hotspot connectivity Â
Trailering App with integrated towing tools and monitoring features Â
Rear Camera Mirror providing an expanded rearward view when needed Â
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Safety & Driver AssistanceÂ
GMC Pro Safety suite designed to enhance driver confidence Â
Forward Collision Alert with Automatic Emergency Braking Â
Front Pedestrian Braking for added urban driving protection Â
Adaptive Cruise Control for relaxed highway travel Â
Lane Departure Warning and Lane Keep technologies Â
Following Distance Indicator for safer highway driving Â
Driver Safety Alert Seat providing directional safety alerts Â
Trailer Side Blind Zone Alert for enhanced towing awareness Â
Rear Cross Traffic Alert when reversing in crowded areas Â
HD Surround Vision offering a comprehensive 360-degree view Â
Front & Rear Park Assist simplifying parking and maneuvering Â
Teen Driver technology encouraging safer driving habits Â
Buckle-to-Drive safety feature for added awareness Â
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Exterior Styling & UtilityÂ
AT4X-exclusive exterior styling with premium off-road design cues Â
Exterior Colour: Summit White — clean, bold, and timeless with rugged appeal Â
18-inch Aluminum Wheels wrapped in aggressive mud-terrain tires Â
Signature LED Headlamps, LED Fog Lamps, and IntelliBeam® automatic high beamsÂ
Power-Retractable Assist Steps with integrated LED lighting Â
Red Front Recovery Hooks highlighting the truck's off-road capability Â
Spray-On Bedliner providing durable cargo box protection Â
LED Cargo Bed Lighting improving visibility after dark Â
Rear Wheelhouse Liners for added durability and protection Â
Power Trailering Mirrors with heating, auto-dimming, and extended visibility functions Â
Chrome and premium AT4X accents creating a commanding presence on and off the road Â
Roof Marker Lamps and integrated bed features designed for serious truck owners Â
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Whether you're hauling heavy equipment, towing a large trailer, exploring remote backcountry trails, or tackling demanding job sites, the 2026 GMC Sierra 2500HD AT4X delivers exceptional diesel power, luxury-grade comfort, advanced technology, and uncompromising capability. It's the ultimate heavy-duty pickup for drivers who refuse to choose between rugged performance and premium refinement.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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