2025 GMC Sierra 2500HD
Pro 2WD
Specifications
Source: manufacturer press kitBrakes
| Front brake diameter | 355 mm |
| Front brake type | ventilated disc |
| Rear brake diameter | 360 mm |
| Rear brake type | solid disc |
Dimensions Exterior
| Ground clearance | 10.2 in |
| Overall height | 79.9 in |
| Overall length | 236.6 in |
| Overall width | 81.8 in |
| Wheelbase | 141.6 in |
Engine Basics
| Aspiration | naturally aspirated |
| Cylinder count | 8 |
| Engine displacement | 6600 cc |
| Fuel injection system | gdi mpi |
| Engine type (full description) | 6.6L V-8 gasoline or E85 FlexFuel |
| Valve configuration | Overhead-valve, two valves per cylinder, variable valve timing |
Engine Output
| Horsepower | 401 hp |
| Torque | 464 lb-ft |
Fuel System
| Fuel tank capacity | 36 gal |
Headroom
| Front headroom | 43.1 in |
| Second-row headroom | 39.9 in |
Legroom
| Front legroom | 44.5 in |
| Second-row legroom | 35.2 in |
Shoulder Room
| Front shoulder room | 66.1 in |
| Second-row shoulder room | 64.9 in |
Steering
| Steering type | Hydraulic power-assisted recirculating ball |
Suspension
| Front suspension type | Short long arms independent front suspension with torsion bars |
| Rear suspension type | Semi-elliptic, two-stage, multi-leaf springs |
Tires
| Tire size | LT245/75R17E ALS |
Transmission
| Final drive ratio | 3.7 |
| Transmission speeds | 10 |
| Transmission type | automatic |
Weights
| Curb weight (maximum) | 7428 lbs |
| Curb weight (minimum) | 6203 lbs |
| Gross vehicle weight rating | 11000 lbs |
| Payload capacity | 3759 lbs |
Wheels
| Wheel diameter | 17 in |
| Wheel material | steel |
Standard & optional equipment
Source: manufacturer press kitSafety2 std · 2 opt
- ABS and Stabilitrak electronic stability assist
- Hydraulic power-assisted Hydroboost brake booster, four-wheel disc brakes
- Front and Rear Park Assist (now available on Pro and SLE trims) optional
- Sierra HD Pro Safety Plus Package (includes Front & Rear Park Assist) optional
Powertrain2 std · 1 opt
- 6.6L V-8 gasoline or E85 FlexFuel engine (401 hp / 464 lb-ft)
- Allison 10L1000 10-speed automatic transmission
- Duramax 6.6L V-8 Turbo-Diesel engine (470 hp / 975 lb-ft) optional
Chassis1 std · 0 opt
- Short long arms independent front suspension with torsion bars
Cargo1 std · 1 opt
- Trailer Brake Controller (standard across all trims)
- Max Towing Package (NHT) – increases diesel conventional tow rating to 20,000 lb on qualifying configurations optional
Ranked by what shoppers ask about first; standard equipment before options.
Transcribed from the manufacturer's official press kit for the 2025 Sierra 2500HD. Confirm with the window sticker for a specific unit.
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