2023 GMC Sierra 2500HD Denali 6.6L Gas
The 2023 GMC Sierra 2500HD Denali 6.6L Gas is a 401-hp 6.6-liter with a 6-speed automatic; electronically controlled 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 |
| Displacement | 6.6 L |
| Horsepower | 401 hp |
| Torque | 464 lb-ft |
| Valvetrain | OHV, two valves per cylinder, variable valve timing (VVT) |
| Bore and Stroke | 103.25 x 98.0 |
| Compression Ratio | 10.8:1 |
| Injection Type | Direct fuel injection |
| Drivetrain | |
| Drive Type | 2WD or 4WD |
| Transmission | |
| Transmission | 6-speed automatic (Hydra-Matic 6L90); electronically controlled |
| 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 (87 octane) or E85 flex-fuel |
| Suspension | |
| Front Suspension | Short long arm (SLA) independent front suspension with torsion bars; Digital Variable Steering Assist (hydraulic power-assisted recirculating ball) |
| Rear Suspension | Semi-elliptic three-stage multi-leaf spring, solid axle |
| Brakes | |
| Front Brake Calipers | Hydraulic power-assisted Hydroboost, ABS, StabiliTrak |
| Front Brake Disc | 14 x 1.6 in (355 x 40 mm) vented disc |
| Rear Brake Disc | 14.1 x 1.3 in (360 x 34 mm) disc |