Vehicle Details
Body Style
Truck
Engine
6.6L 8Cyl
Exterior Colour
Silver
Interior Colour
Black
Transmission
Automatic
Drivetrain
4×4
Stock #
18-260164
Trim Details
Crew Cab Standard Box 4-Wheel Drive AT4
2026 GMC Sierra 2500 HD AT4 Crew Cab – Sterling Metallic
The 2026 GMC Sierra 2500 HD AT4 delivers uncompromising off-road capability, premium refinement, and exceptional heavy-duty performance. Finished in Sterling Metallic and equipped with the iconic AT4 darkened exterior cues, this truck blends rugged design with advanced technology and diesel-powered strength.
Power comes from the legendary 6.6L Duramax Turbo-Diesel V8, producing a massive 470 hp and 975 lb-ft of torque—engineered for confident towing, hill climbing, and long-distance durability. Paired with the 10-Speed Allison Automatic Transmission, this Sierra provides smooth shifting, strong power management, and outstanding grade braking. Its 11,350 lb GVWR, 3.42 rear axle, and factory off-road suspension make it a perfect match for both jobsite demands and weekend adventures.
The AT4 cabin elevates capability with comfort. Jet Black leather with Kalahari accents, premium stitching, and exclusive AT4 detailing create a bold, upscale environment. A 13.4" GMC Premium Infotainment System with Google Built-In, wireless smartphone compatibility, and advanced connectivity keep every drive seamless and intuitive.
This truck is loaded with upgrades, including the AT4 Premium Plus Package, which bundles a power sunroof, advanced driver technology, and high-clearance off-road steps. Additional features like the Rear Camera Mirror, 15" Head-Up Display, dual alternators, Snow Plow Prep package, and fifth-wheel/gooseneck wiring provisions ensure you're ready for any task or terrain.
From deep backcountry trails to heavy towing days, the 2026 Sierra 2500 HD AT4 is built for those who want power, performance, and premium features in every mile.
Key Features Include:
6.6L Duramax Turbo-Diesel V8 (470 hp / 975 lb-ft)
10-Speed Allison Automatic Transmission
11,350 lb GVWR & 3.42 Rear Axle Ratio
20" High Gloss Black AT4 Aluminum Wheels
LT275/65R20 All-Terrain Tires
Jet Black Leather w/ Kalahari Accents
13.4" Premium Infotainment System w/ Google Built-In
AT4 Premium Plus Package
Technology Package (Rear Camera Mirror + 15" Head-Up Display)
Snow Plow Prep / Camper Package
Dual Alternators (220A + 170A)
Fifth-Wheel/Gooseneck Trailer Wiring (UY2)
Exhaust Brake
Off-Road High Clearance Steps (LPO)
Hard Folding RealTruck Advantage Tonneau Cover (LPO)
Winter Grille Cover
Smoked Amber Roof Marker Lamps
All-Weather AT4 Floor Liners (LPO)
Power Rear Sliding Window
Universal Home Remote
Rear Camera Mirror w/ Full Camera Display
3 Years SiriusXM Included
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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Bed Liner
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CornerStep, rear bumper
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Cargo tie downs (12), fixed, rated at 500 lbs (226.8 kg) 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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Automatic Highbeams
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Fog 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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Taillamps, Animated LED Signature Tail, Stop, turn and Reverse lamps
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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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Privacy Glass
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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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Door handles, body-colour
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Integrated Tailgate Step
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Tailgate, gate function manual with EZ Lift includes power lock and release, includes hitch area light
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Tailgate and bed rail protection caps, top
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Bucket Seats
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Leather Seats
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Pass-Through Rear Seat
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Rear Bench Seat
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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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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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Steering wheel, wrapped
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Heated Steering Wheel
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Steering Wheel Audio Controls
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Adjustable Steering Wheel
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Driver Information Centre, enhanced, 12.3" diagonal reconfigurable multicolour digital display
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Rear Seat Reminder
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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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Power Windows
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Power Door Locks
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Keyless Entry
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Keyless Start
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Remote Engine Start
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Adaptive Cruise Control
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Cruise Control
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Wireless Charging
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Security System
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Power outlet, instrument panel, 120-volt (400 watts shared with (KC9) bed mounted power outlet)
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Auxiliary Audio Input
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MP3 Player
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Air vents, rear
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A/C
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Climate Control
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Multi-Zone A/C
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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, 10,850 lbs. (4921 kg) (Included and only available with TK20743 model and (L8T) 6.6L V8 gas engine with 18", 20" or 22" wheels.)
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Keyless Start
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Hill Descent Control
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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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Air filter, heavy-duty
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Air filtration monitoring
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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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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.)
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Tow Hooks
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Skid Plates protect the oil pan, front axle and transfer case
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Frame, fully-boxed, hydroformed front section and a fully-boxed stamped rear section
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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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X31 Off-Road Package includes (JHD) Hill Descent Control, (NZZ) skid plates, Off-Road suspension and Twin-tube Rancho shocks
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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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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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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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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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Following Distance Indicator (Included and only available with (PDI) Sierra HD Pro Safety.)
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Lane Departure Warning
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Cross-Traffic Alert
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Blind Spot Monitor
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Seat Belt Adjustable Guide Loops, front row only
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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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Safety Alert Seat
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Driver Restriction Features
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Tire Pressure Monitor
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Trailering Information Label provides max trailer ratings for tongue weight, conventional, gooseneck and 5th wheel trailering
No matches were found.
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Vehicle NameGMC Sierra 2500HD
-
Body StyleCrew Cab Pickup
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Body CodeE63
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DrivetrainFour Wheel Drive
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Trans Order CodeMGM
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Trans Type10
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Trans Description Cont.Automatic
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First Gear Ratio (:1)4.54
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Second Gear Ratio (:1)2.87
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Third Gear Ratio (:1)2.06
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Fourth Gear Ratio (:1)1.72
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Fifth Gear Ratio (:1)1.48
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Sixth Gear Ratio (:1)1.26
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Seventh Gear Ratio (:1)1.00
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Eighth Gear Ratio (:1)0.85
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Ninth Gear Ratio (:1)0.69
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Tenth Gear Ratio (:1)0.63
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Reverse Ratio (:1)4.54
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Clutch Size (in)N/A
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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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Curb Weight - Front (lbs)4023
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Curb Weight - Rear (lbs)2822
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Gross Vehicle Weight Rating Cap (lbs)11350
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Gross Combined Wt Rating (lbs)27500
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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)18500
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Wt Distributing Hitch - Max Tongue Wt. (lbs)1850
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Fifth Wheel Hitch - Max Trailer Wt. (lbs)17300
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Fifth Wheel Hitch - Max Tongue Wt. (lbs)4325
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Maximum Trailering Capacity (lbs)20000
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Engine Order CodeL5P
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Engine TypeTurbocharged Diesel V8
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Displacement6.6L
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Fuel SystemDirect Injection
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SAE Net Horsepower @ RPM470 @ 2800
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SAE Net Torque @ RPM975 @ 1600
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Cold Cranking Amps @ 0° F (Primary)720
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Maximum Alternator Capacity (amps)220 & 170
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Maximum Alternator WattsN/A
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Suspension Type - FrontShort/Long Arm
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Suspension Type - RearMulti-Leaf Springs
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Axle Ratio (:1) - Front3.42
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Axle Ratio (:1) - Rear3.42
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Shock Absorber Diameter - Front (mm)2.01
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Shock Absorber Diameter - Rear (mm)2.01
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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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Revolutions/Mile @ 45 mph - Front (Rev/Mile)N/A
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Revolutions/Mile @ 45 mph - Rear (Rev/Mile)N/A
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Revolutions/Mile @ 45 mph - Spare (Rev/Mile)N/A
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Front Wheel Size (in)20
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Rear Wheel Size (in)20
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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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Turning Diameter - Curb to Curb (ft)52.7
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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)159
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Length, Overall (in)250.75
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Width, Max w/o mirrors (in)81.85
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Height, Overall (in)79.82
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Cab to Axle (in)42.17
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Ground Clearance, Front (in)10.12
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Ground Clearance, Rear (in)10.12
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Cargo Box Length @ Floor (in)82.2
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Cargo Box Width @ Floor (in)71.4
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Cargo Box Width @ Wheelhousings (in)51.85
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Cargo Box (Area) Height (in)21
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Cargo Volume (ft³)69.5
No matches were found.
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* Plus HST & Licensing. Price includes: Dealer Admin Fee ($499), Etching ($299), Air Tax ($100), Nitrogen Tires ($99.95), Tire Duty ($22.50), and OMVIC fee ($22.00) 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 2500HD AT4 may not match the exact vehicle displayed. Please confirm the accuracy of this information with a sales representative.