2023 GMC Sierra 2500HD Denali 6.6L Diesel
The 2023 GMC Sierra 2500HD Denali 6.6L Diesel is a 445-hp 6.6-liter turbocharged with a 10-speed automatic; electronically controlled and four-wheel drive.
| Spec | Value |
|---|---|
| Engine | |
| Engine Type | Duramax 6.6L V-8 Turbo-Diesel; cast-iron block, cast aluminum heads |
| Displacement | 6.6 L |
| Horsepower | 445 hp |
| Torque | 910 lb-ft |
| Valvetrain | OHV, four valves per cylinder |
| Bore and Stroke | 103.0 x 99.0 |
| Compression Ratio | 16.0:1 |
| Injection Type | Common-rail direct fuel injection |
| Drivetrain | |
| Drive Type | 2WD or 4WD |
| Transmission | |
| Transmission | 10-speed automatic (Allison 10L1000); electronically controlled |
| 1st Gear | 4.54 |
| 2nd Gear | 2.87 |
| 3rd Gear | 2.06 |
| 4th Gear | 1.72 |
| 5th Gear | 1.48 |
| 6th Gear | 1.26 |
| 7th Gear | 1 |
| 8th Gear | 0.85 |
| 9th Gear | 0.69 |
| 10th Gear | 0.63 |
| Reverse | 4.54 |
| Final Drive | 3.42 |
| Fuel Economy | |
| Recommended Fuel | Ultra-low sulfur diesel (ULSD) |
| 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 |