2026 GMC Sierra HD 3500HD AT4
The 2026 GMC Sierra HD 3500HD AT4 is a 401-hp 6.6-liter V8 with an allison 10-speed automatic and four-wheel drive. It starts at $72,800 MSRP.
| Spec | Value |
|---|---|
| Price | |
| MSRP | $72,800 |
| MSRP with Destination | $75,595 |
| Destination Charge | $2,795 |
| Engine | |
| Engine Type | 6.6L V8 OHV VVT |
| Displacement | 6.6 L |
| Horsepower | 401 hp @ 5,200 rpm |
| Torque | 464 lb-ft @ 4000 rpm |
| Valvetrain | OHV, 16 valves, VVT |
| Injection Type | Direct injection |
| Drivetrain | |
| Drive Type | 4WD |
| Transmission | |
| Transmission | Allison 10-speed Automatic |
| Fuel Economy | |
| Recommended Fuel | Regular Unleaded |
| Tank Capacity | 36 gal |
| Suspension | |
| Front Suspension | Independent, stabilizer bar |
| Brakes | |
| Front Brake Calipers | Ventilated Disc |
| Front Brake Disc | Ventilated disc |
| Rear Brake Disc | Ventilated disc |
| Tires & Wheels | |
| Wheels Front | 20-inch painted alloy |
| Wheels Rear | 20-inch painted alloy |
| Tires Front | LT275/65R20 all-terrain |
| Tires Rear | LT275/65R20 all-terrain |
| Dimensions & Weight | |
| Length | 250.8 in |
| Width | 81.9 in |
| Height | 81.2 in |
| Wheelbase | 159 in |
| Ground Clearance | 11.2 in |
| Curb Weight | 7,417 lbs |
| Interior | |
| Headroom Front | 43 in |
| Headroom Rear | 40.1 in |
| Legroom Front | 44.5 in |
| Legroom Rear | 43.4 in |
| Shoulder Room Front | 66 in |
| Shoulder Room Rear | 65.3 in |
| Hip Room Front | 61.2 in |
| Hip Room Rear | 60.2 in |