The 2026 GMC Sierra HD 3500 is GMC’s most capable heavy-duty pickup truck, engineered to deliver exceptional towing performance, unmatched durability, and premium comfort for the most demanding tasks. Available in various trim levels—including Pro, SLE, SLT, AT4, Denali, and Denali Ultimate—the vehicle offers two powerful engine options: a 6.6-liter V8 gasoline engine producing 401 horsepower (299 kW) and 464 lb-ft (629 Nm) of torque, or the highly popular 6.6-liter Duramax turbo-diesel V8 engine delivering 470 horsepower (350 kW) and a massive 975 lb-ft (1,322 Nm) of torque.
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Basic Info |
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Engine |
6.6L Duramax Turbo-Diesel V8 |
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Transmission |
Allison 10-Speed Automatic |
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Vehicle Type |
Heavy-Duty Pickup Truck |
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No. of Doors |
4 |
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Status |
Released |
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Release Date |
2026 |
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Fuel Type |
Diesel |
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Colors |
Summit White, Onyx Black, Sterling Metallic, Downpour Metallic, Titanium Rush Metallic, White Frost Tricoat, Volcanic Red Tintcoat |
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Dimensions & Weight |
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Curb Weight |
8,060 lbs (3,656 kg) |
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Overall Height |
80.9 in (2,055 mm) |
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Overall Length |
250.7 in (6,368 mm) |
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Overall Width |
81.9 in (2,080 mm) |
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Wheelbase |
159.0 in (4,039 mm) |
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Ground Clearance |
10.1 in (257 mm) |
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Shoulder Room |
Front: 66.0 in / Rear: 65.3 in |
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Headroom |
Front: 43.0 in / Rear: 40.1 in |
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Legroom |
Front: 44.5 in / Rear: 43.4 in |
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Hip Room |
Front: 61.2 in / Rear: 60.2 in |
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Front Track |
68.7 in (1,745 mm) |
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Rear Track |
67.3 in (1,709 mm) |
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Engine & Battery |
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Power |
470 hp (350 kW) |
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Torque |
975 lb-ft (1,322 Nm) |
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Engine Type |
6.6L Duramax Turbo-Diesel V8 |
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Drivetrain |
Rear-Wheel Drive (RWD) / Four-Wheel Drive (4WD) |
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Displacement |
6,599 cc |
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Wheels & Tires |
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Tire Size |
LT275/65 R20 |
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Wheel Size |
20-inch Alloy Wheels |
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Wheel Type |
Premium Machined Aluminum Alloy Wheels |
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Steering |
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Turning Diameter |
52.7 ft (16.1 m) |
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Steering Type |
Electric Power Steering |
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Transmission |
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Gearbox |
Allison 10-Speed Automatic |
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Transmission Type |
Automatic |
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Performance |
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Top Speed |
98 mph (158 km/h) |
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Acceleration (0–60 mph) |
7.2 seconds |
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Fuel Economy |
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City |
Not EPA Rated |
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Highway |
Not EPA Rated |
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Combined |
Not EPA Rated |
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Capacities |
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Seating Capacity |
5–6 Passengers |
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Cargo Volume |
69.5–83.5 cu ft (1,968–2,365 L) |
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Fuel Tank Capacity |
36.0 gal (136 L) |
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Suspension |
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Front |
Independent Torsion Bar Suspension |
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Rear |
Multi-Leaf Spring Solid Axle |
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Brakes |
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Brake Type |
Four-Wheel Ventilated Disc Brakes |
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Brake System |
ABS + EBD + Brake Assist |
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Exterior Features |
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Alloy Wheels |
Yes |
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Sun/Moon Roof |
Yes |
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Spoiler |
Yes |
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Front Camera |
Yes |
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Rear Camera |
Yes |
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Roof Antenna |
Yes |
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Rear Parking Aid |
Yes |
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Intermittent Wipers |
Yes |
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Power Folding Mirrors |
Yes |
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LED Headlights |
Yes |
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Interior Features |
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Cruise Control |
Yes |
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Alarm |
Yes |
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Keyless Entry |
Yes |
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Adjustable Steering Wheel |
Yes |
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Parking Aid |
Yes |
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Power Mirrors |
Yes |
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Power Windows |
Yes |
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Vanity Mirror |
Yes |
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Power Steering |
Yes |
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Keyless Start |
Yes |
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Power Door Locks |
Yes |
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Cup Holders |
Yes |
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Glove Box |
Yes |
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Digital Display |
Yes |
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Heated Seats |
Yes |
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Heated Steering Wheel |
Yes |
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Climate Control |
Yes |
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Normal/Sport Modes |
Yes |
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Multi-Function Steering |
Yes |
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Trip Computer |
Yes |
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Anti-Theft System |
Yes |
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Entertainment Features |
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Android Auto |
Yes |
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Apple CarPlay |
Yes |
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AM/FM Stereo |
Yes |
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MP3 Player |
Yes |
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Bluetooth |
Yes |
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Navigation System |
Yes |
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Voice Command |
Yes |
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WiFi Hotspot |
Yes |
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LCD |
Yes |
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Speakers |
Yes |
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Safety Features |
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Brake Assist |
Yes |
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Electronic Stability Control |
Yes |
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Child Safety Lock |
Yes |
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Lane Departure Warning |
Yes |
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ABS |
Yes |
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Driver Airbags |
Yes |
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Passenger Airbags |
Yes |
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Pre-Collision System |
Yes |
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Pedestrian Detection |
Yes |
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Defogger |
Yes |
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Road Sign Assist |
Yes |
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Smart Stop Technology |
Yes |
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Automatic High Beams |
Yes |
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