2021 GMC Sierra 3500HD Gas 4WD DRW
The 2021 GMC Sierra 3500HD Gas 4WD DRW is a 401-hp 6.6-liter with a hydra-matic 6l90 6-speed automatic and four-wheel drive.
| Spec | Value |
|---|---|
| Engine | |
| Engine Type | 6.6L V-8 gasoline / E85 FlexFuel; cast iron block with nodular iron main caps; cast aluminum heads; overhead-valve, 2 valves per cylinder, variable valve timing; direct fuel injection |
| Displacement | 6.6 L |
| Horsepower | 401 hp |
| Torque | 464 lb-ft |
| Valvetrain | OHV, 2 valves per cylinder, variable valve timing |
| Bore and Stroke | 103.25 x 98.0 |
| Compression Ratio | 10.8:1 |
| Injection Type | Direct fuel injection |
| Drivetrain | |
| Drive Type | 4WD |
| Transmission | |
| Transmission | Hydra-Matic 6L90 6-speed automatic |
| 1st Gear | 4.03 |
| 2nd Gear | 2.36 |
| 3rd Gear | 1.53 |
| 4th Gear | 1.15 |
| 5th Gear | 0.85 |
| 6th Gear | 0.67 |
| Reverse | 3.06 |
| Final Drive | 3.73 |
| Fuel Economy | |
| Recommended Fuel | Unleaded regular / E85 FlexFuel |
| Suspension | |
| Front Suspension | Short long arms independent front suspension with torsion bars |
| Rear Suspension | Semi-elliptic 3-stage multi-leaf spring |
| Brakes | |
| Front Brake Disc | 14.0 x 1.6 in / 355 x 40 mm |
| Rear Brake Disc | 14.0 x 1.6 in / 355 x 40 mm |
| Tires & Wheels | |
| Wheels Front | 17-in. steel or aluminum (std.); 18-in. or 20-in. aluminum (SRW) |
| Wheels Rear | 17-in. steel or aluminum (std.); 18-in. or 20-in. aluminum (SRW) |
| Tires Front | LT265/70R17 AT (std. SRW); LT235/80R17 ALS and AT (DRW); LT275/70R18 AT; LT275/65R20 AT (SRW options) |
| Tires Rear | LT265/70R17 AT (std. SRW); LT235/80R17 ALS and AT (DRW); LT275/70R18 AT; LT275/65R20 AT (SRW options) |
| Dimensions & Weight | |
| Length | 266.1 in |
| Width | 81.85 in |
| Height | 80.04 in |
| Wheelbase | 172 in |
| Front Track | 68.1 in |
| Rear Track | 75 in |
| Ground Clearance | 10.39 in |
| Curb Weight | 7,352 lbs |
| Interior | |
| Headroom Front | 43.03 in |
| Headroom Rear | 40.12 in |
| Legroom Front | 44.53 in |
| Legroom Rear | 43.4 in |
| Shoulder Room Front | 66.02 in |
| Shoulder Room Rear | 65.3 in |