Vehicle Details
Body Style
Truck
Engine
6.6L 8Cyl
Exterior Colour
Black
Interior Colour
Black
Transmission
Automatic
Drivetrain
4×4
Stock
303885
Fuel Type
Diesel
Trim Details
Crew Cab Standard Box 4-Wheel Drive AT4
Description
The 2026 GMC Sierra 2500HD AT4 Crew Cab Short Box 4WD fuses heavy-duty strength, off-road confidence, and premium refinement into a commanding pickup built for serious work and rugged adventure. With its bold AT4 stance, darkened accents, and purposeful engineering, this truck delivers professional-grade capability without sacrificing modern comfort and technology. Â
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Performance & CapabilityÂ
Engine: 6.6L Duramax V8 Turbo-Diesel delivering immense torque, confident towing strength, and long-haul durability Â
Transmission: Advanced 10-speed automatic designed for smooth power delivery under heavy loads and highway cruising Â
Drivetrain: Autotrac 2-speed 4WD system for maximum traction across mud, snow, gravel, and steep terrain Â
Suspension: Z71 off-road tuned suspension with high-capacity components for stability under load and trail confidence Â
Axle Ratio: 3.42 rear axle engineered for balanced towing performance and controlled acceleration Â
Trailering Equipment: Advanced integrated trailer brake controller, Hitch Guidance with Hitch View, and full Trailering App integration Â
Max Trailing Capability: Gooseneck/5th wheel prep package with heavy-duty frame, leaf springs, and reinforced rear axle design Â
Off-Road Confidence: Skid plates, hill descent control, and driver-selectable locking front and rear differentials for extreme terrain control Â
Exhaust Brake System: Enhanced downhill control for confident towing on steep grades Â
High Idle Mode & Heavy-Duty Air Filtration: Designed for demanding jobsite and cold-start durability Â
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Winter & All-Season StrengthÂ
Heated & Ventilated Front Seats plus Heated Rear Seats for year-round comfort in extreme climates Â
Heated Steering Wheel for cold-weather driving comfort and control Â
Remote Start System to pre-condition the cabin before every drive Â
Dual-Zone Automatic Climate Control with reinforced heating/defrost system for harsh winters Â
Engine Block Heater for reliable cold starts in sub-zero temperatures Â
Rain-Sensing Wipers and Winter Grille Cover for improved cold-weather efficiency Â
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Interior Comfort & ConvenienceÂ
Premium Front Bucket Seating with power adjustability, lumbar support, and driver memory settings Â
Power Sliding Rear Window for ventilation and cargo access convenience Â
Wireless Charging Pad with multiple USB ports and 120V outlets throughout cabin and bed Â
Keyless Open & Push-Button Start for seamless daily operation Â
Rear Seat Storage Package with added practicality for tools, gear, or travel essentials Â
Power Sunroof delivering natural light and an open-cabin feel Â
Premium Floor Liners and all-weather protection designed for worksite durability Â
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Technology & ConnectivityÂ
GMC Premium 13.4" Infotainment System with Google Built-In, navigation, and intuitive touchscreen control Â
12" Digital Driver Information Display with full customization and real-time vehicle data Â
Multicolor Head-Up Display projecting key driving information into the windshield Â
Bose Premium Audio System delivering immersive, high-fidelity sound throughout the cabin Â
Wireless Apple CarPlay® and Android Autoâ„¢ integration for seamless smartphone connectivity Â
Wi-Fi Hotspot capability to keep passengers and devices connected on the go Â
Digital Rear Camera Mirror, Bed View Camera, and Trailer Camera Provisions for full situational awareness Â
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Safety & Driver AssistanceÂ
GMC Pro Safety Suite with advanced collision avoidance and driver alert systems Â
Forward Collision Alert with Automatic Emergency Braking and Front Pedestrian Braking Â
Lane Departure Warning with Lane Keep Assist for highway confidence Â
Rear Cross Traffic Alert and Trailer Side Blind Zone Alert for safer towing and reversing Â
HD Surround Vision with 360° camera coverage for tight maneuvering and trailering precision Â
Front and Rear Park Assist for added confidence in urban and jobsite environments Â
Following Distance Indicator and Adaptive Cruise Control for stress-reduced highway driving Â
Safety Alert Seat providing tactile warnings for enhanced driver awareness Â
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Exterior Styling & UtilityÂ
AT4 Off-Road Design with bold blacked-out accents and aggressive stance Â
20" Black Aluminum Wheels with all-terrain tires engineered for durability and grip Â
Signature LED Headlamps, Fog Lamps, and Roof Marker Lights for maximum visibility Â
GMC MultiPro Tailgate with multiple configurations for loading, stepping, and workspace functionality Â
Spray-On Bedliner and LED Bed Lighting for durability and nighttime utility Â
Power Retractable Assist Steps with LED illumination for easy cabin access Â
Red Front Recovery Hooks and heavy-duty skid plates for authentic off-road capability Â
High-strength steel bed and reinforced frame designed for extreme payload and towing demands Â
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Whether conquering remote trails, towing heavy equipment, or handling demanding jobsite duties, the 2026 GMC Sierra 2500HD AT4 delivers uncompromising diesel power, advanced trailering intelligence, and refined comfort. It stands as a heavy-duty truck engineered for those who expect maximum capability with premium confidence and off-road authority.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-Terrain
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Tires - Rear All-Terrain
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Conventional Spare Tire
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Tire carrier lock keyed cylinder lock that utilizes same key as ignition and door
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Bumper, front, body-colour lower
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Bumper, rear body-colour with bumper CornerSteps
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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
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Mouldings, beltline, Black
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Grille (Gloss Black header and grille insert bars with Black Chrome accents.)
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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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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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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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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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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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Steering wheel, wrapped
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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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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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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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Wireless Charging
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Security System
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Auxiliary Audio Input
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MP3 Player
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Power outlet, bed mounted, 120-volt (400 watts shared with (KI4) instrument panel mounted power outlet)
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A/C
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Climate Control
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Multi-Zone A/C
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Rear Defrost
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Auto-Dimming Rearview Mirror
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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, 10,850 lbs. (4921 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 protect the oil pan, front axle and transfer case
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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 twin-tube shocks
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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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X31 Off-Road Package includes (JHD) Hill Descent Control, (NZZ) skid plates, Off-Road suspension and Twin-tube Rancho shocks
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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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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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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)43.03
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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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Curb Weight - Front (lbs)4013
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Curb Weight - Rear (lbs)2812
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Gross Vehicle Weight Rating Cap (lbs)11750
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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)20000
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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 - FrontShort/Long Arm w/Torsion Bar
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Suspension Type - Rear2-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)51
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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 CodeQF9
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Rear Tire Order CodeQF9
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Spare Tire Order CodeZYG
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Front Tire SizeLT275/65R20
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Rear Tire SizeLT275/65R20
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Spare Tire SizeLT275/70R18
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Front Wheel Size (in)20
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Rear Wheel Size (in)20
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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)52.7
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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)79.82
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Cab to Axle (in)42.17
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Ground Clearance, Front (in)10.12
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Ground Clearance, Rear (in)10.12
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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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* Every reasonable effort is made to ensure the accuracy of the information listed above. Vehicle pricing, incentives, options (including standard equipment), and technical specifications listed is for the 2026 GMC Sierra 2500HD AT4 may not match the exact vehicle displayed. Please confirm the accuracy of this information with a sales representative.
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