2026 GMC Sierra 3500HD

The 2026 GMC Sierra 3500HD AT4 combines uncompromising heavy-duty diesel capability with premium off-road engineering and advanced technology. Designed for drivers who demand exceptional towing strength without sacrificing comfort, this rugged AT4 delivers bold styling, refined craftsmanship, and the confidence to tackle any roador no road at all. 
Performance & Capability 
Engine: 6.6L Duramax Turbo-Diesel V8 delivering exceptional torque and heavy-duty towing capability 

Transmission: Allison 10-speed automatic transmission providing smooth, confident shifting under every load 

Drivetrain: Autotrac 2-Speed 4-Wheel Drive 4WD for outstanding traction in all driving conditions 

Rear Axle Ratio: 3.42 rear axle balancing towing performance with highway efficiency 

Off-Road Suspension Package engineered to handle challenging terrain with confidence 

Automatic Locking Rear Differential maximizing traction on loose or uneven surfaces 

Hill Descent Control providing added confidence on steep grades 

Skid Plates protecting critical underbody components during off-road adventures 

Heavy-Duty Trailering Package built to handle demanding towing applications 

Gooseneck/5th Wheel Prep Package with factory bed provisions for heavy trailer compatibility 

Integrated Trailer Brake Controller, Hitch Guidance with Hitch View, Trailer Camera Provisions, and Trailering App simplifying every towing experience 

Engine Exhaust Brake, heavy-duty air filter, engine oil cooler, transmission oil cooler, and 220-amp alternator ready for serious workloads 

FlexRide Drive Mode System optimizing performance for varying terrain and driving conditions 

Winter & Weather Comfort 
Heated & Ventilated Front Seats for year-round comfort 

Heated Rear Outboard Seats providing premium passenger comfort 

Heated Steering Wheel for cold-weather driving 

Remote Vehicle Start allowing you to pre-condition the cabin 

Dual-Zone Automatic Climate Control maintaining personalized cabin temperatures 

Rain-Sensing Windshield Wipers automatically adapting to changing weather 

Engine Block Heater for dependable cold-weather starts 

Winter Grille Cover improving cold-weather engine performance 

Premium All-Weather Floor Liners with removable carpet inserts protecting the interior year-round 

Rear Window Defogger and Deep-Tinted Glass enhancing comfort and visibility 

Interior Comfort & Convenience 
Premium Front Bucket Seats with power driver and passenger adjustment 

Driver Memory Settings for seat and mirror preferences 

Power Sliding Rear Window and Rear Seat Storage Package for added practicality 

Keyless Open & Push-Button Start for effortless entry and ignition 

Wireless Charging Pad with multiple USB charging ports throughout the cabin 

Wireless Apple CarPlay & Android Auto compatibility 

13.4-inch GMC Premium Infotainment Touchscreen with Google Built-In, Navigation, and Bluetooth connectivity 

12-inch Reconfigurable Digital Driver Information Display offering customizable vehicle information 

Technology Package featuring a 15-inch Multicolor Head-Up Display and Rear Camera Mirror 

Bose Premium Audio System delivering exceptional sound quality 

Universal Home Remote, 120-Volt Instrument Panel Outlet, and 120-Volt Bed-Mounted Power Outlet for worksite convenience 

Leather-Wrapped Steering Wheel with integrated audio controls 

Power Sunroof bringing natural light into the cabin 

Safety & Driver Assistance 
GMC Sierra HD Pro Safety Package for enhanced driver confidence 

Adaptive Cruise Control for more relaxed highway travel 

Forward Collision Alert with Automatic Emergency Braking 

Trailer Side Blind Zone Alert improving awareness while towing 

Rear Cross Traffic Alert for added confidence when reversing 

HD Surround Vision with Bed View Camera providing outstanding visibility around the truck 

Front & Rear Park Assist simplifying parking and maneuvering 

Driver Safety Alert Seat delivering tactile safety notifications 

IntelliBeam Automatic High Beams 

Teen Driver Mode and Buckle-to-Drive promoting safer driving habits 

Tire Pressure Monitoring System and Theft-Deterrent System for added peace of mind 

Exterior Styling & Utility 
Exterior Colour: Titanium Rush Metallic with exclusive AT4 styling and rugged premium finishes 

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

Signature LED Headlamps, LED Fog Lamps, LED Cargo Bed Lighting, and LED Roof Marker Lamps 

GMC MultiPro Tailgate with EZ Lift Power Lock & Release functionality 

Factory Spray-On Bedliner protecting the cargo box from heavy-duty use 

Heated Power Trailer Mirrors with Auto-Dimming and integrated task lighting 

Red Front Recovery Hooks emphasizing the AT4s off-road capability 

Off-Road High Clearance Steps providing improved access without compromising trail clearance 

Rear Bumper CornerSteps for convenient bed access 

Durable pickup bed with integrated gooseneck preparation ready for work or recreation 

Whether youre towing heavy equipment, venturing into rugged backcountry, or enjoying premium comfort on the open highway, the 2026 GMC Sierra 3500HD AT4 delivers exceptional diesel performance, advanced technology, and uncompromising off-road capability. Its the perfect combination of heavy-duty strength, refined luxury, and adventure-ready confidence. 
 

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 Equipment
StabiliTrak, stability control system with Proactive Roll Avoidance and traction control includes electronic trailer sway control and hill start assist
Airbags, 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 airbag
Front and Rear Park Assist, ultrasonic
Rear Cross Traffic Alert
Teen 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 driver
Rear Seat Reminder
Hitch Guidance dynamic single line to aid in truck trailer alignment for hitching
Safety Alert Seat
Hill Descent Control
Trailer Side Blind Zone Alert
Tire 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/Tilt
Front 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's
HD 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 software
Forward 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 only
Rear 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 lighting
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
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)
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 Equipment
Seat adjuster, driver 10-way power including lumbar
Seat adjuster, passenger 10-way power including lumbar
Seating, heated driver and front outboard passenger
Seats, ventilated driver and front passenger
Seats, heated second row outboard seats
Driver memory, recalls driver "presets" for power driver seat and outside mirrors
Centre Console, floor-mounted with cup holders, cell phone storage, power cord management, hanging file folder capability
Floor covering, colour-keyed carpeting
Steering wheel, heated
Steering wheel audio controls
Exterior Temperature Display located in radio display
Compass, located in instrument cluster
Window, power front, drivers express up/down
Window, power front, passenger express up/down
Windows, power rear, express down
Door locks, power
Remote vehicle starter system
Theft-deterrent system, unauthorized entry
Power 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 electric
Mirror, inside rearview auto-dimming
Air conditioning, dual-zone automatic climate control
Steering column, manual Tilt-Wheel and telescoping
Adaptive Cruise Control
Steering wheel, wrapped
Wireless Charging
USB Ports, 2 (first row) located on console
Air vents, rear
Driver Information Centre, enhanced, 12.3" diagonal reconfigurable multicolour digital display
Assist handles, front A-pillar mounted for driver and passenger, rear B-pillar mounted
Seats, front bucket with centre console
Premium Floor Liners with removable carpet insert, front
Premium Floor Liners with removable carpet insert, rear
GMC Premium information Display- 13.4" diagonal Multicolour touch screen
Keyless Open and Start includes remote keyless entry
USB ports, (2) charge-only, rear
Seat, 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 surfaces
USB ports, 2, Charge/Data ports located inside centre console
Exterior Equipment
Single Rear Wheels
Tire carrier lock keyed cylinder lock that utilizes same key as ignition and door
CornerStep, rear bumper
Mirrors, 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-tinted
Tailgate and bed rail protection caps, top
Door handles, body-colour
Mouldings, beltline, Black
Lamps, cargo area, cab mounted integrated with centre high mount stop lamp, with switch in bank on left side of steering wheel
Mirror caps, high gloss Black
Wheelhouse liners, rear
Wipers, front rain-sensing
Fog lamps, LED
Bed Step, Black integrated on forward portion of bed on driver and passenger side
Tire, spare LT275/70R18 all-terrain, blackwall
Bumper, front, body-colour lower
Bumper, rear body-colour with bumper CornerSteps
IntelliBeam, 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 fob
Taillamps, Animated LED Signature Tail, Stop, turn and Reverse lamps
Tailgate, gate function manual with EZ Lift includes power lock and release, includes hitch area light
Headlamps, Animated LED projectors, LED turn signals and Daytime Running Lamps
Tires, 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 details
Wheels, 20" (50.8 cm) High Gloss black aluminum wheels, 8 spokes
Cargo tie downs (12), fixed, rated at 500 lbs per corner
Grille, Gloss Black header and grille insert bars with Black chrome accents
Bedliner, Spray-on Pickup bedliner with GMC logo (does not include spray-on liner on tailgate due to Black composite inner panel)
Entertainment Equipment
Bose Sound System, premium 7-speaker system with Richbass woofer
Bluetooth for phone connectivity to vehicle infotainment system
Wireless phone projection for Apple CarPlay and Android Auto
Audio 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 Subscription
SiriusXM 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 Equipment
Engine, 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 monitoring
Transfer case, two-speed active electronic Autotrac with push button control
Four wheel drive
Cooling, external engine oil cooler
Cooling, auxiliary external transmission oil cooler
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.)
Alternator, 170 amps (Requires (L8T) 6.6L V8 gas engine.)
Trailer brake controller, integrated
Frame, fully-boxed, hydroformed front section and a fully-boxed stamped rear section
Brakes, 4-wheel antilock, 4-wheel disc with DURALIFE rotors
Brake lining wear indicator
Rear axle, 3.73 ratio (Requires (L8T) 6.6L V8 gas engine.)
Pickup bed includes bed assist step
Push Button Start
Air filter, heavy-duty
Auto-locking rear differential
Recovery hooks, Red
Skid Plates protect the oil pan, front axle and transfer case
Suspension, Off-Road includes twin-tube shocks
Capless Fuel Fill (Requires (L8T) 6.6L gas V8 engine.)
GVWR, 11,700 lbs. (5307 kg) with single rear wheels (Included and only available with model TK30943 model and (L8T) 6.6L V8 gas engine. Requires single rear wheels.)
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 fatigue
Transmission, 10-Speed automatic
Other Equipment
Trailering Package includes trailer hitch, 7-pin and 4-pin connectors and (CTT) Hitch Guidance
X31 Off-Road Package includes (JHD) Hill Descent Control, (NZZ) skid plates, Off-Road suspension and Twin-tube Rancho shocks
Sierra 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 Braking
ProGrade Trailering System includes (PZ8) Hitch Guidance with Hitch View and (UET) In-vehicle Trailering App