2026 GMC Sierra 3500HD

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Engine

Spec	Value
Layout / Cylinders	V‑8 / 8 cylinders
Displacement	6.6 L
Horsepower	401 hp (gas); 470 hp (diesel)
Torque	464 lb‑ft (gas); 975 lb‑ft (diesel)
Engine Layout	Front engine, longitudinal

Performance

Spec	Value
0‑60 mph	Not typically published for heavy‑duty trucks
Towing Capacity	~14,500 lbs (gas w/ standard setup) to ~20,000 lbs with diesel & proper hitch
Payload	~4,480–4,580 lbs depending on configuration

Transmission

Spec	Value
Type	10‑Speed Sequential Shift Control Automatic w/ Overdrive

Fuel Consumption

Spec	Value
City / Highway / Combined	EPA estimates not available for 3500HD class

Body / Dimensions

Spec	Value
Length	~236.3–257.2 in depending on cab/bed configuration
Width	~81.8–81.9 in
Height	~80.9 in
Wheelbase	~142 in (regular cab) / ~162.5 in (crew cab)
Doors	2 or 4 (depending on cab)
Curb Weight	~6,329–6,976 lbs (varies by engine and cab)

Capacities

Spec	Value
Fuel Tank Capacity	~36 gal
Seating Capacity	2–6 depending on cab and configuration (regular vs crew)

The 2026 GMC Sierra 3500HD is a heavy‑duty full‑size pickup built for towing and hauling, with robust V‑8 engines and a 10‑speed automatic transmission. The standard gas 6.6 L V‑8 delivers 401 hp and 464 lb‑ft of torque for serious work capability, while the available 6.6 L turbo‑diesel V‑8 boosts output to around 470 hp and a massive ~975 lb‑ft of torque for maximum towing. Towing capacity can exceed 20,000 lbs with the diesel and proper hitch setup, making the Sierra 3500HD a top choice for towing trailers, campers, and heavy equipment. Comfortable cabins, modern infotainment, and advanced safety tech are available especially on higher trims like Denali and AT4X.

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2026 GMC Sierra 3500HD

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2026 GMC Sierra 3500HD

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