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2026 GMC Sierra 3500HD AT4
Vehicle Details
Body Style
Truck
Engine
6.6L 8Cyl
Exterior Colour
Tan
Interior Colour
Black
Transmission
Automatic
Drivetrain
4×4
Stock #
301825
Trim Details
4WD Crew Cab Standard Box AT4
The 2026 GMC Sierra 3500HD AT4 4WD Crew Cab Standard Box delivers uncompromising power, premium craftsmanship, and rugged off-road capability in one commanding package. Built for those who demand strength and refinement in equal measure, this heavy-duty pickup blend advanced towing technology, all-terrain durability, and first-class interior comfort. Whether you’re conquering the job site, towing through the mountains, or exploring the backcountry, the Sierra 3500HD AT4 stands tall — confident, capable, and unmistakably GMC.Â
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Performance & CapabilityÂ
Engine: 6.6L Duramax® Turbo-Diesel V8 for immense torque and confident pulling powerÂ
Transmission: Allison® 10-Speed Automatic Transmission for seamless shifts and durability under loadÂ
Drivetrain: Autotrac® 4-Wheel Drive (4WD) system with 2-speed transfer case for precision tractionÂ
Axle Ratio: 3.42 Rear Axle balancing power, towing capability, and efficiencyÂ
Suspension: Z71 Off-Road Suspension with skid plates and Rancho® shocks for superior off-pavement controlÂ
Trailering Capability: Gooseneck/5th Wheel Prep Package and integrated Trailer Brake Controller for heavy-duty towing confidenceÂ
Trailering Tech: Hitch Guidance, Trailer Camera Provisions, and HD Surround Vision for complete towing awarenessÂ
Additional Capability: Engine Exhaust Brake, Hill Descent Control, and Automatic Locking Rear Differential for enhanced control on steep grades or rough terrainÂ
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Winter ReadinessÂ
Heated & Ventilated Front Seats to maintain comfort in every seasonÂ
Heated Rear Outboard Seats for second-row warmthÂ
Heated Steering Wheel for cold-weather driving comfortÂ
Remote Vehicle Start to warm the cabin before you step insideÂ
Dual-Zone Automatic Climate Control with reinforced heating and defrost systemsÂ
Engine Block Heater and Winter Grille Cover for optimized performance in freezing conditionsÂ
All-Terrain Tires and Skid Plates providing confident traction and underbody protection on snow or iceÂ
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Comfort & ConvenienceÂ
Front Bucket Seats with Centre Console offering storage, connectivity, and wireless device chargingÂ
Power Driver and Passenger Seats with memory function for customized comfortÂ
13.4" GMC Premium Infotainment Touchscreen with Google Built-In, Navigation, and Wireless Apple CarPlay® / Android Autoâ„¢Â
12.3" Digital Driver Information Centre with customizable full-colour displayÂ
Bose® Premium Audio System delivering clear, immersive soundÂ
Head-Up Display (HUD) and Rear Camera Mirror for enhanced visibility and driver awarenessÂ
Power Sliding Rear Window and Universal Home Remote for added convenienceÂ
120V AC Power Outlets in cabin and bed for tools, camping gear, or worksite needsÂ
Spray-On Bedliner with LED Bed Lighting and EZ Lift Power Tailgate for everyday utilityÂ
Rear Seat Storage Package for concealed storage solutionsÂ
Power Sunroof for open-air driving and natural lightÂ
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Safety & Driver AssistanceÂ
GMC Pro Safety and AT4 Premium Safety Packages delivering advanced protection and confidenceÂ
Forward Collision Alert, Front Pedestrian Braking, and Automatic Emergency Braking for proactive safetyÂ
Adaptive Cruise Control and Following Distance Indicator for stress-free highway drivingÂ
Lane Departure Warning and Lane Keep Assist to help maintain lane disciplineÂ
Trailer Side Blind Zone Alert and Rear Cross Traffic Alert for safer towing and reversingÂ
HD Surround Vision with Bed View Camera providing a 360° perspectiveÂ
Driver Safety Alert Seat for intuitive, haptic feedback to potential hazardsÂ
Teen Driver & Buckle-to-Drive Safety Systems promoting responsible driving habitsÂ
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Exterior Styling & UtilityÂ
AT4 Off-Road Design: Signature black chrome grille, red recovery hooks, and body-colour bumpersÂ
20" Black Aluminum Wheels wrapped in LT275/65R-20 All-Terrain Tires for an aggressive stanceÂ
LED Headlamps, Fog Lamps, and Roof Marker Lamps for superior illumination and bold presenceÂ
Exterior Colour: Coastal Dune Metallic — a refined, rugged hue exclusive to the AT4 lineupÂ
Off-Road High Clearance Steps (Dealer Installed) enhancing both function and styleÂ
GMC MultiPro Tailgate with six versatile configurations for loading, step access, and on-site functionalityÂ
LED Cargo Bed Lighting & Perimeter Lighting for after-dark visibilityÂ
Red Tow Hooks & Skid Plates for trail-ready durability and distinctive AT4 characterÂ
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Whether it’s hauling, towing, or exploring new frontiers, the 2026 GMC Sierra 3500HD AT4 blends brute strength with modern sophistication. It’s the heavy-duty truck that redefines capability — engineered for those who expect more from every mileÂ
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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CornerStep, rear bumper
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Bed Step, Black integrated on forward portion of bed on driver and passenger side
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Mouldings, beltline, Black
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Wheelhouse liners, rear
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Bed Liner
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Cargo tie downs (12), fixed, rated at 500 lbs per corner
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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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LED Headlights
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Automatic Highbeams
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Fog Lamps
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Taillamps, Animated LED Signature Tail, Stop, turn and Reverse 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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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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Intermittent Wipers
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Rain Sensing Wipers
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Variable Speed Intermittent Wipers
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Privacy Glass
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Door handles, body-colour
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Integrated Tailgate Step
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Tailgate and bed rail protection caps, top
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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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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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Pass-Through Rear Seat
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Rear Bench 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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Centre Console, floor-mounted with cup holders, cell phone storage, power cord management, hanging file folder capability
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Floor covering, colour-keyed carpeting
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Floor Mats
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Heated Steering Wheel
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Adjustable Steering Wheel
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Steering Wheel Audio Controls
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Driver Information Centre, enhanced, 12.3" diagonal reconfigurable multicolour digital display
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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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Tire Pressure Monitor
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Window, power front, drivers express up/down
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Power Windows
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Power Door Locks
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Remote Engine Start
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Keyless Entry
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Keyless Start
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Adaptive Cruise Control
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Cruise Control
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Security System
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Wireless Charging
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Power outlet, instrument panel, 120-volt (400 watts shared with (KC9) bed mounted power outlet)
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USB ports, (2) charge-only, rear
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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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Air vents, rear
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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, 11,550 lbs. (5239 kg) with single rear wheels (Included and only available with TK30743 model and (L8T) 6.6L V8 gas engine. Requires single rear wheels.)
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Keyless Start
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Air filter, heavy-duty
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Air filtration monitoring
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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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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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Tow Hooks
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Frame, fully-boxed, hydroformed front section and a fully-boxed stamped rear section
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Skid Plates protect the oil pan, front axle and transfer case
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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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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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X31 Off-Road Package includes (JHD) Hill Descent Control, (NZZ) skid plates, Off-Road suspension and Twin-tube Rancho shocks
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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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Trailering Information Label provides max trailer ratings for tongue weight, conventional, gooseneck and 5th wheel trailering
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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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Hill Descent 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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Hitch Guidance dynamic single line to aid in truck trailer alignment for hitching
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Trailer Camera Provisions and trailer viewing software
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Cross-Traffic Alert
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Blind Spot Monitor
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Lane Departure Warning
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Following Distance Indicator (Included and only available with (PDI) Sierra HD Pro Safety.)
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Safety Alert Seat
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Rear Seat Reminder
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Driver Restriction Features
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Seat Belt Adjustable Guide Loops, front row only
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Rear Seat Belt Indicator (Requires Crew Cab or Double Cab model.)
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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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Tire Pressure Monitor
No matches were found.
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Vehicle NameGMC Sierra 3500HD
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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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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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Gross Axle Wt Rating - Rear (lbs)7250
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Gross Vehicle Weight Rating Cap (lbs)12100
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Gross Combined Wt Rating (lbs)30000
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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)20000
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Wt Distributing Hitch - Max Tongue Wt. (lbs)2000
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Fifth Wheel Hitch - Max Trailer Wt. (lbs)21300
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Fifth Wheel Hitch - Max Tongue Wt. (lbs)5325
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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 TypeHydroformed
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Suspension Type - FrontShort/Long Arm w/Torsion Bars
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Suspension Type - Rear3-Stage Multi-Leaf
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Axle Type - FrontIndependent
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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)18 x 8
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Rear Wheel Size (in)18 x 8
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Spare Wheel Size (in)18 x 8
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Front Wheel MaterialAluminum
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Rear Wheel MaterialAluminum
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Spare Wheel MaterialSteel
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Steering TypePwr Recirculating Ball
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Steering Ratio (:1), At LockN/A
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Turning Diameter - Curb to Curb (ft)52.7
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Turning Diameter - Wall to Wall (ft)N/A
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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)158.94
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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)81.2
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Cab to Axle (in)42.17
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Ground Clearance, Front (in)11.18
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Ground Clearance, Rear (in)11.18
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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 3500HD AT4 may not match the exact vehicle displayed. Please confirm the accuracy of this information with a sales representative.