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2026 GMC Sierra 3500HD AT4
Vehicle Details
Body Style
Truck
Engine
6.6L 8Cyl
Exterior Colour
Silver
Interior Colour
Black
Transmission
Automatic
Drivetrain
4×4
Stock #
21865
Trim Details
4WD Crew Cab Long Box AT4
Elevate your driving experience with the brand new 2026 GMC Sierra 3500HD AT4 in a stunning Silver finish, complete with a solid 4×4 drivetrain for unbeatable handling on any terrain. This truck boasts a commanding presence with its powerful exterior, making it a perfect fit for those who need a reliable vehicle without compromising on style.
The interior welcomes you with luxurious Black leather seats, providing both heated and cooled options for ultimate comfort no matter what the weather is like outside. The Crew Cab Long Box offers a spacious environment, ensuring you have plenty of room for both passengers and cargo.
Stay connected and safe with next-generation technology like the intuitive navigation system, smart device integration, and a Wi-Fi hotspot. Safety features such as lane assist, a backup camera, parking sensors, and adaptive cruise control offer peace of mind during every drive. The remote start system and keyless entry provide added convenience along with amenities like a heated steering wheel and power seats that cater to a comfortable and tailored driving experience.
This vehicle is perfect for individuals who need both power and luxury, whether you're heading off-road or managing daily tasks. Don't miss the chance to own this excellent truck—reach out to our dealership now to learn more and to schedule a test drive. Your ideal driving companion awaits.
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, 11,700 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.)
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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 CodeMKM
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Trans Type10
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Trans Description Cont.Automatic
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First Gear Ratio (:1)
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Second Gear Ratio (:1)
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Third Gear Ratio (:1)
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Fourth Gear Ratio (:1)
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Fifth Gear Ratio (:1)
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Sixth Gear Ratio (:1)
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Seventh Gear Ratio (:1)
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Eighth Gear Ratio (:1)
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Ninth Gear Ratio (:1)
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Tenth Gear Ratio (:1)
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Reverse Ratio (:1)
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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)5200
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Gross Axle Wt Rating - Rear (lbs)7250
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Gross Vehicle Weight Rating Cap (lbs)11700
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Gross Combined Wt Rating (lbs)26000
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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)16000
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Wt Distributing Hitch - Max Tongue Wt. (lbs)1600
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Fifth Wheel Hitch - Max Trailer Wt. (lbs)17800
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Fifth Wheel Hitch - Max Tongue Wt. (lbs)4450
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Maximum Trailering Capacity (lbs)20000
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Engine Order CodeL8T
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Engine TypeGas V8
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Displacement6.6L
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Fuel SystemDirect Injection
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SAE Net Horsepower @ RPM401 @ 5200
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SAE Net Torque @ RPM464 @ 4000
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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)170
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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) - Front3.73
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Axle Ratio (:1) - Rear3.73
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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)57.0
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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)172
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Length, Overall (in)266.77
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Width, Max w/o mirrors (in)81.85
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Height, Overall (in)80.81
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Cab to Axle (in)55.24
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Ground Clearance, Front (in)11.14
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Ground Clearance, Rear (in)11.14
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Cargo Box Length @ Floor (in)98.22
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Cargo Box Width @ Floor (in)71.4
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Cargo Box Width @ Wheelhousings (in)50.55
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Cargo Box (Area) Height (in)21
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Cargo Volume (ft³)83.5
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.