Vehicle Details
Body Style
Truck
Engine
6.6L 8Cyl
Exterior Colour
Silver
Interior Colour
Black
Transmission
Automatic
Drivetrain
4×4
Stock
303778
Fuel Type
Diesel
Trim Details
4WD Crew Cab Standard Box AT4
Description
The 2026 GMC Sierra 3500HD AT4 blends heavy-duty capability, premium comfort, and off-road confidence into one commanding pickup. Designed for drivers who demand serious towing strength without sacrificing refinement, this Sierra HD stands tall with rugged AT4 styling, advanced trailering technology, and upscale interior craftsmanship, ready for demanding worksites, long hauls, and weekend adventures alike.Â
Performance & CapabilityÂ
Engine: Duramax® 6.6L V8 Turbo-Diesel delivering immense torque and heavy-duty pulling power Â
Transmission: Allison® 10-speed automatic transmission engineered for smooth, confident performance Â
Drivetrain: 4-Wheel Drive (4WD) with Autotrac® two-speed transfer case for dependable traction Â
Off-Road Suspension: Factory Z71 Off-Road Suspension Package tuned for rugged terrain capability Â
Rear Differential: Automatic locking rear differential for enhanced traction in low-grip conditions Â
Hill Descent Control for improved confidence on steep grades and uneven terrain Â
Exhaust Brake and heavy-duty cooling systems optimized for towing and mountain driving Â
Trailering Equipment: Integrated trailer brake controller, Hitch Guidance with Hitch ViewÂ
Gooseneck/5th Wheel Prep Package for serious towing versatility Â
Skid Plates and red front recovery hooks for added off-road protection and utility Â
Rear Axle Ratio: 3.42 ratio balancing towing strength and highway efficiency Â
Â
Winter & Weather ComfortÂ
Heated & Ventilated Front Seats for year-round comfort in every climate Â
Heated Rear Outboard Seats and Heated Steering Wheel for cold-weather convenience Â
Remote Start System to warm up or cool down the cabin before you step inside Â
Dual-Zone Automatic Climate Control for personalized cabin comfort Â
Engine Block Heater for reliable winter starts in harsh Canadian conditions Â
Rain-Sensing Windshield Wipers and deep-tinted glass for enhanced visibility and comfort Â
Premium All-Weather Floor Liners with removable carpet inserts for easy cleanup Â
Â
Interior Comfort & ConvenienceÂ
Front Bucket Seats with power adjustment and driver memory settings Â
Power Sliding Rear Window and Rear Seat Storage Package for added versatility Â
Wireless Charging Pad and multiple USB ports throughout the cabin Â
Push-Button Start and Keyless Open for effortless access and operation Â
Wireless Apple CarPlay® & Android Autoâ„¢ compatibility for seamless smartphone integration Â
13.4" GMC Premium Infotainment Touchscreen with Google Built-In and navigation capability Â
12" Reconfigurable Digital Driver Information Centre with customizable vehicle dataÂ
Bose® Premium Sound System delivering rich, immersive audio quality Â
Power Sunroof bringing natural light and open-air freedom into the cabin Â
Heated power trailering mirrors with auto-dimming functionality for improved towing visibility Â
Â
Safety & Driver AssistanceÂ
Sierra HD Pro Safety Package enhancing driver awareness and confidence Â
Forward Collision Alert with Automatic Emergency Braking Â
Lane Departure Warning and Following Distance Indicator for added highway security Â
Adaptive Cruise Control for smoother long-distance driving Â
HD Surround Vision and Bed View Camera for easier maneuvering and trailer alignment Â
Trailer Side Blind Zone Alert for improved awareness while towing Â
Front & Rear Park Assist to simplify tight parking situations Â
Front Pedestrian Braking and Rear Cross Traffic Alert for added urban confidence Â
Teen Driver Mode and Rear Seat Reminder for additional peace of mind Â
Â
Exterior Styling & UtilityÂ
20" Black Aluminum Wheels wrapped in aggressive all-terrain tires Â
Exterior Colour: Sterling Metallic — bold, refined, and unmistakably premium Â
AT4-exclusive styling with rugged accents and elevated stance Â
LED Headlamps, LED Fog Lamps, LED Cargo Bed Lighting, and roof marker lamps for outstanding visibility Â
GMC MultiPro Tailgate offering multiple loading and worksite configurations Â
Spray-On Bedliner and 120V Bed-Mounted Power Outlet for work-ready practicality Â
Off-Road High Clearance Assist Steps for easier cabin access Â
Rear Bumper CornerSteps and EZ Lift power lock/release tailgate for everyday convenience Â
Active Aero Shutters helping improve aerodynamics and efficiency Â
Whether you’re hauling heavy equipment, towing a large RV, or exploring off-the-grid destinations, the 2026 GMC Sierra 3500HD AT4 delivers uncompromising diesel power, advanced technology, and premium comfort in one exceptionally capable package. It’s a heavy-duty truck engineered for drivers who demand rugged performance with unmistakable GMC refinement.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 CodeQF9
-
Rear Tire Order CodeQF9
-
Spare Tire Order CodeZYG
-
Front Tire SizeLT275/65R20
-
Rear Tire SizeLT275/65R20
-
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
Crew Cab Standard Box 4-Wheel Drive AT4X
VIN: 1GT4UZEY5TF312356
In-Transit
Crew Cab Standard Box 4-Wheel Drive AT4
VIN: 1GT4UPEY4TF251618
4WD Crew Cab Standard Box SLT
VIN: 1GT4UUEY3TF268778
Crew Cab Short Box 4-Wheel Drive Denali Ultimate
VIN: 1GTUUHEL2TZ354979
City: 16L/100 km • Hwy: 12.1L/100 km
4WD Crew Cab Standard Box Denali
VIN: 1GT4UWEY1TF264241
* 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.
Calculate Payments
Finance
Lease