Vehicle Details
Body Style
Truck
Engine
6.6L 8Cyl
Exterior Colour
Tan
Interior Colour
Black
Transmission
Automatic
Drivetrain
4×4
Stock
303347
Fuel Type
Diesel
Trim Details
4WD Crew Cab Standard Box AT4
Description
The 2026 GMC Sierra 3500HD AT4 blends heavy-duty strength, off-road capability, and premium craftsmanship into a commanding full-size pickup. With its bold AT4 styling, advanced trailering tech, and refined interior, this truck is built to conquer demanding jobs while keeping you comfortable on every drive.Â
Performance & CapabilityÂ
Engine: Duramax® 6.6L V8 Turbo-Diesel delivering exceptional torque and heavy-duty pulling powerÂ
Transmission: Allison® 10-speed automatic transmission for smooth, confident shifting under loadÂ
Drivetrain: Autotrac® 4-Wheel Drive system with 2-speed transfer case for maximum tractionÂ
Suspension: Off-road-tuned suspension with Rancho® shocks for enhanced control on rough terrainÂ
Axle Ratio: 3.42 rear axle optimized for towing strength and highway efficiencyÂ
Trailering Capability: Integrated trailer brake controller, hitch guidance with Hitch View, and in-vehicle trailering appÂ
Gooseneck / 5th Wheel Prep Package for serious hauling capabilityÂ
Exhaust Brake System for improved control when towing downhillÂ
Heavy-Duty Cooling Systems including transmission and engine oil coolersÂ
Hill Descent Control and automatic locking rear differential for off-road confidenceÂ
Off-Road & AT4 CapabilityÂ
Z71 Off-Road Package with skid plates and underbody protectionÂ
20" Black Aluminum Wheels wrapped in aggressive all-terrain tiresÂ
Red Front Recovery Hooks and off-road drive modes for added confidenceÂ
Hill Descent Control and terrain management system for rugged environmentsÂ
High ground clearance and durable chassis engineering for demanding trailsÂ
Interior Comfort & ConvenienceÂ
Front Bucket Seats with premium Jet Black/Kalahari interior accentsÂ
Heated & Ventilated Front Seats and Heated Rear Outboard SeatsÂ
Power Driver & Passenger Seats with memory settingsÂ
Heated Leather-Wrapped Steering Wheel for cold-weather comfortÂ
Dual-Zone Automatic Climate Control with rear air ventsÂ
Power Sliding Rear Window and Rear Seat Storage PackageÂ
Wireless Charging Pad and multiple USB ports throughout the cabinÂ
Remote Start System and Keyless Open & Push-Button StartÂ
Power Sunroof bringing light into the spacious crew cabÂ
Premium Floor Liners for all-weather protectionÂ
Technology & ConnectivityÂ
13.4" GMC Premium Infotainment Touchscreen with Google Built-In and NavigationÂ
12" Digital Driver Information Center with customizable displaysÂ
Wireless Apple CarPlay® & Android Autoâ„¢ for seamless smartphone integrationÂ
Bose® Premium Audio System for rich, immersive soundÂ
Head-Up Display projecting key driving information onto the windshieldÂ
Rear Camera Mirror and HD Surround Vision for enhanced visibilityÂ
Bed View Camera and Trailer Camera Provisions for towing confidenceÂ
Wi-Fi® Hotspot Capability and connected servicesÂ
Safety & Driver AssistanceÂ
GMC Pro Safety Package with advanced driver assistance featuresÂ
Forward Collision Alert with Automatic Emergency BrakingÂ
Lane Departure Warning and Following Distance IndicatorÂ
Front & Rear Park Assist for easier maneuveringÂ
Rear Cross Traffic Alert and Trailer Side Blind Zone AlertÂ
HD Surround Vision providing a 360° perspectiveÂ
Front Pedestrian Braking and Safety Alert SeatÂ
Teen Driver Mode and Buckle-to-Drive systemÂ
Exterior Styling & UtilityÂ
AT4-exclusive grille with darkened accents and bold GMC badgingÂ
LED Headlamps, Fog Lamps, and Cargo Bed Lighting for maximum visibilityÂ
Spray-On Bedliner for enhanced durability and cargo protectionÂ
GMC MultiPro Tailgate with six-function versatilityÂ
EZ Lift Power Lock & Release Tailgate for ease of useÂ
Power-Retractable Assist Steps with LED lightingÂ
Deep-Tinted Glass and aggressive off-road stanceÂ
LED Roof Marker Lamps and signature lighting designÂ
Bed-Mounted 120V Power Outlet for jobsite functionalityÂ
Exterior Colour: Coastal Dune — a rugged, earth-toned finish that complements its off-road personalityÂ
Whether you’re hauling heavy equipment, towing with confidence, or exploring off the beaten path, the 2026 GMC Sierra 3500HD AT4 delivers uncompromising power, advanced technology, and rugged refinement, built for those who demand strength without sacrificing comfort.Â
Â
Packages & Options
Standard Equipment
Technical Specifications
-
AM/FM Stereo
-
Auxiliary Audio Input
-
Bluetooth Connection
-
MP3 Player
-
Navigation System
-
Smart Device Integration
-
Requires Subscription
-
Satellite Radio
-
Premium Sound System
-
WiFi Hotspot
-
Aluminum Wheels
-
Tires - Front All-Terrain
-
Tires - Rear All-Terrain
-
Conventional Spare Tire
-
Tire carrier lock keyed cylinder lock that utilizes same key as ignition and door
-
Bumper, front, body-colour lower
-
Bumper, rear body-colour with bumper CornerSteps
-
CornerStep, rear bumper
-
Bed Step, Black integrated on forward portion of bed on driver and passenger side
-
Mouldings, beltline, Black
-
Wheelhouse liners, rear
-
Bed Liner
-
Cargo tie downs (12), fixed, rated at 500 lbs per corner
-
Grille, Gloss Black header and grille insert bars with Black chrome accents
-
Daytime Running Lights
-
LED Headlights
-
Automatic Highbeams
-
Fog Lamps
-
Taillamps, Animated LED Signature Tail, Stop, turn and Reverse lamps
-
Lamps, cargo area, cab mounted integrated with centre high mount stop lamp, with switch in bank on left side of steering wheel
-
LED Cargo Area Lighting located in cargo bed activated with switch on centre switch bank or key fob
-
Heated Mirrors
-
Integrated Turn Signal Mirrors
-
Power Folding Mirrors
-
Power Mirror(s)
-
Mirror caps, high gloss Black
-
Intermittent Wipers
-
Rain Sensing Wipers
-
Variable Speed Intermittent Wipers
-
Privacy Glass
-
Door handles, body-colour
-
Integrated Tailgate Step
-
Tailgate and bed rail protection caps, top
-
Tailgate, gate function manual with EZ Lift includes power lock and release, includes hitch area light
-
Bucket Seats
-
Leather Seats
-
Driver Adjustable Lumbar
-
Power Driver Seat
-
Passenger Adjustable Lumbar
-
Power Passenger Seat
-
Pass-Through Rear Seat
-
Rear Bench Seat
-
Heated Front Seat(s)
-
Cooled Front Seat(s)
-
Heated Rear Seat(s)
-
Mirror Memory
-
Seat Memory
-
Centre Console, floor-mounted with cup holders, cell phone storage, power cord management, hanging file folder capability
-
Floor covering, colour-keyed carpeting
-
Floor Mats
-
Heated Steering Wheel
-
Adjustable Steering Wheel
-
Steering Wheel Audio Controls
-
Driver Information Centre, enhanced, 12.3" diagonal reconfigurable multicolour digital display
-
GMC Premium information Display- 13.4" diagonal Multicolour touch screen
-
Exterior Temperature Display located in radio display
-
Compass, located in instrument cluster
-
Tire Pressure Monitor
-
Window, power front, drivers express up/down
-
Power Windows
-
Power Door Locks
-
Remote Engine Start
-
Keyless Entry
-
Keyless Start
-
Adaptive Cruise Control
-
Cruise Control
-
Security System
-
Wireless Charging
-
Power outlet, instrument panel, 120-volt (400 watts shared with (KC9) bed mounted power outlet)
-
USB ports, (2) charge-only, rear
-
Auxiliary Audio Input
-
MP3 Player
-
Power outlet, bed mounted, 120-volt (400 watts shared with (KI4) instrument panel mounted power outlet)
-
A/C
-
Climate Control
-
Multi-Zone A/C
-
Air vents, rear
-
Rear Defrost
-
Auto-Dimming Rearview Mirror
-
Assist handles, front A-pillar mounted for driver and passenger, rear B-pillar mounted
-
8 Cylinder Engine
-
Gasoline Fuel
-
10-Speed A/T
-
A/T
-
Rear axle, 3.73 ratio (Requires (L8T) 6.6L V8 gas engine.)
-
Running Boards/Side Steps
-
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.)
-
Keyless Start
-
Air filter, heavy-duty
-
Air filtration monitoring
-
Transfer case, two-speed active electronic Autotrac with push button control
-
Locking/Limited Slip Differential
-
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
-
Tow Hooks
-
Frame, fully-boxed, hydroformed front section and a fully-boxed stamped rear section
-
Skid Plates protect the oil pan, front axle and transfer case
-
Suspension, Off-Road includes twin-tube shocks
-
Power Steering
-
4-Wheel Disc Brakes
-
ABS
-
Brake lining wear indicator
-
Capless Fuel Fill (Requires (L8T) 6.6L gas V8 engine.)
-
Automatic Highbeams
-
Front Collision Mitigation
-
Front Collision Warning
-
Lane Departure Warning
-
X31 Off-Road Package includes (JHD) Hill Descent Control, (NZZ) skid plates, Off-Road suspension and Twin-tube Rancho shocks
-
Tow Hitch
-
ProGrade Trailering System includes (PZ8) Hitch Guidance with Hitch View and (UET) In-vehicle Trailering App
-
Trailering Information Label provides max trailer ratings for tongue weight, conventional, gooseneck and 5th wheel trailering
-
Front Collision Mitigation
-
Front Collision Warning
-
Stability Control
-
Traction Control
-
Hill Descent Control
-
Daytime Running Lights
-
Driver Air Bag
-
Front Head Air Bag
-
Front Side Air Bag
-
Passenger Air Bag
-
Passenger Air Bag Sensor
-
Rear Head Air Bag
-
Requires Subscription
-
Telematics
-
Rear Parking Aid
-
Aerial View Display System
-
Back-Up Camera
-
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
-
Hitch Guidance dynamic single line to aid in truck trailer alignment for hitching
-
Trailer Camera Provisions and trailer viewing software
-
Cross-Traffic Alert
-
Blind Spot Monitor
-
Lane Departure Warning
-
Following Distance Indicator (Included and only available with (PDI) Sierra HD Pro Safety.)
-
Safety Alert Seat
-
Rear Seat Reminder
-
Driver Restriction Features
-
Seat Belt Adjustable Guide Loops, front row only
-
Rear Seat Belt Indicator (Requires Crew Cab or Double Cab model.)
-
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)
-
Tire Pressure Monitor
No matches were found.
-
Vehicle NameGMC Sierra 3500HD
-
Body StyleCrew Cab Pickup
-
Body CodeE63
-
DrivetrainFour Wheel Drive
-
Trans Order CodeMGM
-
Trans Type10
-
Trans Description Cont.Automatic
-
First Gear Ratio (:1)4.54
-
Second Gear Ratio (:1)2.87
-
Third Gear Ratio (:1)2.06
-
Fourth Gear Ratio (:1)1.72
-
Fifth Gear Ratio (:1)1.48
-
Sixth Gear Ratio (:1)1.26
-
Seventh Gear Ratio (:1)1.00
-
Eighth Gear Ratio (:1)0.85
-
Ninth Gear Ratio (:1)0.69
-
Tenth Gear Ratio (:1)0.63
-
Reverse Ratio (:1)4.54
-
Passenger Capacity5
-
Front Head Room (in)39.88
-
Front Leg Room (in)44.53
-
Front Shoulder Room (in)66.02
-
Front Hip Room (in)61.18
-
Second Head Room (in)40.12
-
Second Leg Room (in)43.4
-
Second Shoulder Room (in)65.3
-
Second Hip Room (in)60.24
-
Gross Axle Wt Rating - Front (lbs)5600
-
Gross Axle Wt Rating - Rear (lbs)7250
-
Curb Weight - Front (lbs)4032
-
Curb Weight - Rear (lbs)2928
-
Gross Vehicle Weight Rating Cap (lbs)12100
-
Gross Combined Wt Rating (lbs)30000
-
Dead Weight Hitch - Max Trailer Wt. (lbs)5000
-
Dead Weight Hitch - Max Tongue Wt. (lbs)500
-
Wt Distributing Hitch - Max Trailer Wt. (lbs)20000
-
Wt Distributing Hitch - Max Tongue Wt. (lbs)2000
-
Fifth Wheel Hitch - Max Trailer Wt. (lbs)21300
-
Fifth Wheel Hitch - Max Tongue Wt. (lbs)5325
-
Maximum Trailering Capacity (lbs)20000
-
Engine Order CodeL5P
-
Engine TypeTurbocharged Diesel V8
-
Displacement6.6L
-
Fuel SystemDirect Injection
-
SAE Net Horsepower @ RPM470 @ 2800
-
SAE Net Torque @ RPM975 @ 1600
-
Engine Oil CoolerYes
-
Cold Cranking Amps @ 0° F (Primary)720
-
Maximum Alternator Capacity (amps)220
-
Frame TypeHydroformed
-
Suspension Type - FrontShort/Long Arm w/Torsion Bars
-
Suspension Type - Rear3-Stage Multi-Leaf
-
Axle Type - FrontIndependent
-
Axle Ratio (:1) - Front3.42
-
Axle Ratio (:1) - Rear3.42
-
Shock Absorber Diameter - Front (mm)51
-
Shock Absorber Diameter - Rear (mm)51
-
Stabilizer Bar Diameter - Front (in)1.38
-
Front Tire Order CodeQF6
-
Rear Tire Order CodeQF6
-
Spare Tire Order CodeZYG
-
Front Tire SizeLT275/70R18
-
Rear Tire SizeLT275/70R18
-
Spare Tire SizeLT275/70R18
-
Front Wheel Size (in)18 x 8
-
Rear Wheel Size (in)18 x 8
-
Spare Wheel Size (in)18 x 8
-
Front Wheel MaterialAluminum
-
Rear Wheel MaterialAluminum
-
Spare Wheel MaterialSteel
-
Steering TypePwr Recirculating Ball
-
Steering Ratio (:1), At LockN/A
-
Turning Diameter - Curb to Curb (ft)52.7
-
Turning Diameter - Wall to Wall (ft)N/A
-
Brake TypePwr
-
Brake ABS System4-Wheel
-
Disc - FrontYes
-
Disc - RearYes
-
Front Brake Rotor Diam x Thickness (in)14 x 1.6
-
Rear Brake Rotor Diam x Thickness (in)14.1 x 1.3
-
Fuel Tank Capacity, Approx (L)136
-
Wheelbase (in)158.94
-
Length, Overall (in)250.75
-
Width, Max w/o mirrors (in)81.85
-
Height, Overall (in)81.2
-
Cab to Axle (in)42.17
-
Ground Clearance, Front (in)11.18
-
Ground Clearance, Rear (in)11.18
-
Cargo Box Length @ Floor (in)82.2
-
Cargo Box Width @ Floor (in)71.4
-
Cargo Box Width @ Wheelhousings (in)51.85
-
Cargo Box (Area) Height (in)21
-
Cargo Volume (ft³)69.5
No matches were found.
Similar Vehicles
4WD Crew Cab Standard Box SLT
VIN: 1GT4UUEY3TF268778
4WD Crew Cab Standard Box AT4
VIN: 1GT4UVEY0TF232696
4WD Crew Cab Standard Box Denali
VIN: 1GT4UWEY1TF264241
Crew Cab Standard Box 4-Wheel Drive AT4X
VIN: 1GT4UZEY9TF258320
4WD Crew Cab Standard Box AT4
VIN: 1GT4UVEY3TF250755
4WD Crew Cab Standard Box Denali
VIN: 1GT4UWEY5TF295122
* 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.