The 2026 GMC Sierra 3500HD AT4 Crew Cab combines heavy-duty capability, premium comfort, and off-road confidence into one bold and rugged package. Finished in sophisticated Coastal Dune and powered by the legendary Duramax Turbo-Diesel engine, this Sierra HD is engineered to handle demanding workloads, challenging terrain, and long-distance towing while surrounding occupants with advanced technology and refined craftsmanship. 

Performance & Capability 

Engine: Duramax 6.6L V8 Turbo-Diesel delivering exceptional torque, towing capability, and long-haul durability 

Transmission: Allison-inspired 10-speed automatic transmission providing smooth, confident power delivery 

Drivetrain: Autotrac Four-Wheel Drive 4WD system for dependable traction in all conditions 

Rear Axle Ratio: 3.42 axle optimized for towing performance and highway efficiency 

Off-Road Suspension Package engineered for enhanced control on rough terrain 

Automatic Locking Rear Differential for improved traction when conditions demand it 

Hill Descent Control for confident navigation on steep grades 

Skid Plates helping protect critical underbody components during off-road adventures 

Digital Variable Steering Assist for precise steering response and enhanced stability 

Engine Exhaust Brake for increased control when towing or descending hills 

Heavy-Duty Air Filtration and Cooling Systems built to handle demanding workloads 

Gooseneck / 5th-Wheel Prep Package for serious towing capability 

Integrated Trailer Brake Controller and ProGrade Trailering Technology for confident towing 

Trailer Camera Provisions, Hitch Guidance, Hitch View, and In-Vehicle Trailering App for added convenience and visibility 

Winter & Weather Comfort 

Heated and Ventilated Front Seats providing comfort through every season 

Heated Rear Outboard Seats for premium passenger comfort 

Heated Steering Wheel for cold-weather convenience 

Remote Vehicle Start to warm or cool the cabin before you enter 

Dual-Zone Automatic Climate Control allowing personalized temperature settings 

Engine Block Heater for dependable cold-weather starts 

Rain-Sensing Windshield Wipers automatically adapting to changing weather conditions 

Premium All-Weather Floor Liners with removable carpet inserts for year-round protection 

Winter Grille Cover helping maintain optimal engine temperatures in extreme climates 

Interior Comfort & Convenience 

Premium AT4 Interior featuring Jet Black and Kalahari accents with rugged refinement 

Front Bucket Seats with Power Driver and Passenger Adjustments 

Driver Memory Settings for personalized seating and mirror positions 

Power Sliding Rear Window for enhanced ventilation and convenience 

Rear Seat Storage Package maximizing interior versatility 

Wireless Charging Pad and multiple USB charging ports throughout the cabin 

Keyless Open and Push-Button Start for seamless everyday operation 

Universal Home Remote for convenient access to compatible garage systems 

Power Sunroof bringing natural light and an open-air feel to the cabin 

Rear Camera Mirror providing an unobstructed rearward view 

Technology & Connectivity 

GMC Premium Infotainment System with expansive 13.4-inch touchscreen display 

Google Built-In Compatibility with integrated navigation and connected services 

Wireless Apple CarPlay and Android Auto connectivity 

12-inch Digital Driver Information Center with customizable vehicle information 

Multi-Color Head-Up Display projecting key information directly into the drivers line of sight 

Bose Premium Audio System delivering rich, immersive sound quality 

Wireless Phone Projection for seamless smartphone integration 

120-Volt Interior Power Outlet and Bed-Mounted 120-Volt Outlet for worksite convenience 

HD Surround Vision and Bed View Camera for enhanced visibility around the truck 

Wi-Fi Hotspot Capability helping keep passengers connected on the go 

Safety & Driver Assistance 

Sierra HD Pro Safety Package providing advanced driver-assistance technologies 

Forward Collision Alert with Automatic Emergency Braking 

Front Pedestrian Braking for added urban driving confidence 

Lane Departure Warning helping keep you centered on the road 

Adaptive Cruise Control enhancing comfort on long highway drives 

Trailer Side Blind Zone Alert for increased awareness while towing 

Rear Cross Traffic Alert for safer reversing in busy areas 

HD Surround Vision offering a comprehensive 360-degree view around the vehicle 

Front and Rear Park Assist simplifying parking and maneuvering 

Following Distance Indicator helping maintain safer spacing on the road 

Driver Safety Alert Seat providing intuitive directional warnings 

Teen Driver Mode and Buckle-to-Drive safety features 

Exterior Styling & Utility 

Exterior Colour: Coastal Dune a distinctive, premium finish that complements the Sierra HDs rugged AT4 character 

20-Inch Black Aluminum Wheels wrapped in aggressive All-Terrain Tires 

AT4-Specific Styling with bold accents and elevated off-road presence 

LED Headlamps, LED Fog Lamps, and LED Cargo Bed Lighting for outstanding visibility 

IntelliBeam Automatic High-Beam Headlamps adapting to changing road conditions 

GMC MultiPro Tailgate offering six versatile configurations for loading, access, and worksite functionality 

Spray-On Bedliner protecting the cargo box from daily wear and tear 

Rear Wheelhouse Liners enhancing durability and protection 

Off-Road High-Clearance Assist Steps providing easier access while maintaining trail capability 

Red Front Recovery Hooks adding both functionality and rugged styling 

Power Locking EZ Lift Tailgate for added convenience and ease of use 

Whether youre hauling heavy equipment, towing a large RV, or heading off the beaten path, the 2026 GMC Sierra 3500HD AT4 delivers uncompromising capability, advanced technology, and premium comfort. Built for those who demand professional-grade strength without sacrificing refinement, this heavy-duty truck is ready for whatever challenge comes next. 

 



AMVIC Licensed Dealer

*Every reasonable effort is made to ensure the accuracy of the information shown. The Standard Equipment listed is provided at the time of the manufacture and may not match the exact vehicle displayed. Please confirm with a sales representative the accuracy of this information.

Engine: 8 Cylinder Engine 6.6L
Safety EquipmentStabiliTrak, stability control system with Proactive Roll Avoidance and traction control includes electronic trailer sway control and hill start assistAirbags, Dual-stage frontal airbags for driver and front outboard passenger; Seat-mounted side-impact airbags for driver and front outboard passenger; Head-curtain airbags for front and rear outboard seating positions; Includes front outboard Passenger Sensing System for frontal outboard passenger airbagFront and Rear Park Assist, ultrasonicRear Cross Traffic AlertTeen Driver a configurable feature that lets you activate customizable vehicle settings associated with a key fob, to help encourage safe driving behaviour. It can limit certain available vehicle features, and it prevents certain safety systems from being turned off. An in-vehicle report card gives you information on driving habits and helps you to continue to coach your new driverRear Seat ReminderHitch Guidance dynamic single line to aid in truck trailer alignment for hitchingSafety Alert SeatHill Descent ControlTrailer Side Blind Zone AlertTire Pressure Monitoring System auto learn, includes Tire Fill Alert (does not apply to spare tire)Hitch Guidance with Hitch View with image adjustment, Pan/Zoom/TiltFront Pedestrian Braking (Included and only available with (PDI) Sierra HD Pro Safety.)Automatic Emergency Braking (Included and only available with (PDI) Sierra HD Pro Safety.)LED Signature DRL'sHD Surround Vision provides the driver with an overhead view of the scene around the vehicle on a centre stack display. Includes front camera washer.Trailer Camera Provisions and trailer viewing softwareForward Collision Alert (Included and only available with (PDI) Sierra HD Pro Safety.)Following Distance Indicator (Included and only available with (PDI) Sierra HD Pro Safety.)Lane Departure Warning (Included and only available with (PDI) Sierra HD Pro Safety.)Seat Belt Adjustable Guide Loops, front row onlyRear Seat Belt Indicator (Requires Crew Cab or Double Cab model.)OnStar Services capable (See onstar.ca for details and limitations. Services vary by model. Service plan required.)Daytime Running Lamps LED signature lightingBed View Camera camera in the CHMSL to show a view of the cargo bed, display located in infotainment screen, includes Two Trailer Camera ProvisionsBuckle 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)OnStar Basics (OnStar Fleet Basics for Fleet) Drive more confidently with up to 8 years of core OnStar services including mobile app commands, connectivity for select apps that provide in-vehicle voice assistance and navigation with real-time traffic, and Automatic Crash Response. (Requires (UE1) OnStar. OnStar Basics includes access to remote commands through your vehicle's mobile app (compatible smartphone required); Automatic Crash Response (not all vehicles may transmit all crash data; OnStar links to emergency services); and wireless connectivity for select apps that provide in-vehicle voice assistance and navigation with real-time traffic (Voice & Maps apps are subject to change at any time and may be provided by third parties). Term begins from date of vehicle delivery. Paid subscription required after expiry. Services are dependent on compatible wireless networks provided by third-party wireless service providers, working vehicle electrical systems, GPS signal and other factors outside GM control. Changes in technology and wireless networks may limit or prevent the operation of certain services. For customers who also separately receive or purchase a Premium Plan or Vehicle Data Plan to use Wi-Fi Hotspot and In-Vehicle Apps, the data provided as part of that plan will also be used by any Voice & Maps apps which already had data connectivity under this Basics plan; if any applicable data caps are reached, Voice & Maps apps will continue to function for the duration of this Basics plan but additional vehicle data plan(s) must be purchased to use Wi-Fi Hotspot and In-Vehicle Apps. Services, connectivity, and capabilities have additional terms and limitations and are subject to change, and will vary by model, vehicle configuration, conditions, and geographical and technical restrictions. Non-refundable and no cash value. See onstar.ca for details.)Interior EquipmentSeat adjuster, driver 10-way power including lumbarSeat adjuster, passenger 10-way power including lumbarSeating, heated driver and front outboard passengerSeats, ventilated driver and front passengerSeats, heated second row outboard seatsDriver memory, recalls driver "presets" for power driver seat and outside mirrorsCentre Console, floor-mounted with cup holders, cell phone storage, power cord management, hanging file folder capabilityFloor covering, colour-keyed carpetingSteering wheel, heatedSteering wheel audio controlsExterior Temperature Display located in radio displayCompass, located in instrument clusterWindow, power front, drivers express up/downWindow, power front, passenger express up/downWindows, power rear, express downDoor locks, powerRemote vehicle starter systemTheft-deterrent system, unauthorized entryPower outlet, instrument panel, 120-volt (400 watts shared with (KC9) bed mounted power outlet)Power outlet, bed mounted, 120-volt (400 watts shared with (KI4) instrument panel mounted power outlet)Defogger, rear-window electricMirror, inside rearview auto-dimmingAir conditioning, dual-zone automatic climate controlSteering column, manual Tilt-Wheel and telescopingAdaptive Cruise ControlSteering wheel, wrappedWireless ChargingUSB Ports, 2 (first row) located on consoleAir vents, rearDriver Information Centre, enhanced, 12.3" diagonal reconfigurable multicolour digital displayAssist handles, front A-pillar mounted for driver and passenger, rear B-pillar mountedSeats, front bucket with centre consolePremium Floor Liners with removable carpet insert, frontPremium Floor Liners with removable carpet insert, rearGMC Premium information Display- 13.4" diagonal Multicolour touch screenKeyless Open and Start includes remote keyless entryUSB ports, (2) charge-only, rearSeat, Up-level Rear with Storage Package, 60/40 folding bench for Crew Cab models includes full-length bench seat, seatback storage on left and right side, centre fold out armrest with 2 cupholders, full cab width underseat storage, (includes child seat top tether anchor)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.)Seat trim, Perforated Front Leather seating surfacesUSB ports, 2, Charge/Data ports located inside centre consoleExterior EquipmentSingle Rear WheelsTire carrier lock keyed cylinder lock that utilizes same key as ignition and doorCornerStep, rear bumperMirrors, outside power-adjustable vertical trailering with heated and auto-dimming upper glass, (driver and passenger) lower convex mirrors, turn signal indicators, puddle lamps, perimeter lighting, auxiliary lighting, power folding/extending (extends 3.31" [84.25mm])Glass, deep-tintedTailgate and bed rail protection caps, topDoor handles, body-colourMouldings, beltline, BlackLamps, cargo area, cab mounted integrated with centre high mount stop lamp, with switch in bank on left side of steering wheelMirror caps, high gloss BlackWheelhouse liners, rearWipers, front rain-sensingFog lamps, LEDBed Step, Black integrated on forward portion of bed on driver and passenger sideTire, spare LT275/70R18 all-terrain, blackwallBumper, front, body-colour lowerBumper, rear body-colour with bumper CornerStepsIntelliBeam, automatic high beam on/off (Included and only available with (PDI) Sierra HD Pro Safety.)LED Cargo Area Lighting located in cargo bed activated with switch on centre switch bank or key fobTaillamps, Animated LED Signature Tail, Stop, turn and Reverse lampsTailgate, gate function manual with EZ Lift includes power lock and release, includes hitch area lightHeadlamps, Animated LED projectors, LED turn signals and Daytime Running LampsTires, LT275/65R20 all-terrain, blackwall (Requires single rear wheels.)Tailgate, GMC MultiPro Tailgate with six functional load/access features. NOTE: Auto release can be disabled if ball hitch is installed. See Owner's manual for detailsWheels, 20" (50.8 cm) High Gloss black aluminum wheels, 8 spokesCargo tie downs (12), fixed, rated at 500 lbs per cornerGrille, Gloss Black header and grille insert bars with Black chrome accentsBedliner, Spray-on Pickup bedliner with GMC logo (does not include spray-on liner on tailgate due to Black composite inner panel)Entertainment EquipmentBose Sound System, premium 7-speaker system with Richbass wooferBluetooth for phone connectivity to vehicle infotainment systemWireless phone projection for Apple CarPlay and Android AutoAudio System, 13.4" diagonal Premium GMC Infotainment System with Google built in apps such as navigation and voice assistance, includes colour touch-screen, multi-touch display, AM/FM stereo, Bluetooth streaming audio for music and most phones; featuring wireless Android Auto and Apple CarPlay capability for compatible phones.Wi-Fi Hotspot capable (Terms and limitations apply. See onstar.com or dealer for details.)SiriusXM Trial SubscriptionSiriusXM with 360L Trial Subscription. SiriusXM with 360L transforms your customers' ride with our most extensive and personalized radio experience on the road. (IMPORTANT: The SiriusXM trial subscription is not provided on vehicles that are ordered for Fleet Daily Rental ("FDR") use. Certain features and/or content may not be available unless an active data connection is enabled in the vehicle. Content varies by SiriusXM subscription plan. Features and display may vary by vehicle. All SiriusXM services require a subscription, sold separately by SiriusXM after the trial period. Your SiriusXM service will automatically stop at the end of your trial unless you decide to subscribe. If you decide to continue service after your trial, the subscription plan you choose will continue for an indeterminate term and you will be charged according to your chosen payment method at the then-current rates unless and until you cancel. Taxes apply. Please see the SiriusXM Customer Agreement at siriusxm.ca/terms for complete terms and how to cancel, which includes calling SiriusXM at 1-888-539-7474. All rates, content, and programming are subject to change. SiriusXM uses personal information in accordance with SiriusXM Privacy Policy, available at siriusxm.ca/privacy. SiriusXM Canada Inc. "SiriusXM", the SiriusXM logo, channel names and logos are trademarks of Sirius XM Radio Inc. and are used under license.)Mechanical EquipmentEngine, 6.6L V8 with Direct Injection and Variable Valve Timing, gasoline (401 hp [299 kW] @ 5200 rpm, 464 lb-ft of torque [629 N-m] @ 4000 rpm)Air filtration monitoringTransfer case, two-speed active electronic Autotrac with push button controlFour wheel driveCooling, external engine oil coolerCooling, auxiliary external transmission oil coolerBattery, 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.)Alternator, 170 amps (Requires (L8T) 6.6L V8 gas engine.)Trailer brake controller, integratedFrame, fully-boxed, hydroformed front section and a fully-boxed stamped rear sectionBrakes, 4-wheel antilock, 4-wheel disc with DURALIFE rotorsBrake lining wear indicatorRear axle, 3.73 ratio (Requires (L8T) 6.6L V8 gas engine.)Pickup bed includes bed assist stepPush Button StartAir filter, heavy-dutyAuto-locking rear differentialRecovery hooks, RedSkid Plates protect the oil pan, front axle and transfer caseSuspension, Off-Road includes twin-tube shocksCapless Fuel Fill (Requires (L8T) 6.6L gas V8 engine.)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.)Steering, Digital Variable Steering Assist This system automatically adjusts steering based on speed, road conditions, and other inputs to reduce driver effort and fatigueTransmission, 10-Speed automaticOther EquipmentTrailering Package includes trailer hitch, 7-pin and 4-pin connectors and (CTT) Hitch GuidanceX31 Off-Road Package includes (JHD) Hill Descent Control, (NZZ) skid plates, Off-Road suspension and Twin-tube Rancho shocksSierra HD Pro Safety includes (UEU) Forward Collision Alert, (UE4) Following Distance Indicator, (UKJ) Front Pedestrian Braking, (TQ5) IntelliBeam, (UFL) Lane Departure Warning, (T8Z) Buckle to Drive and (UHY) Automatic Emergency BrakingProGrade Trailering System includes (PZ8) Hitch Guidance with Hitch View and (UET) In-vehicle Trailering App