Comparison GMC Sierra HD Regular Cab Long Box 3500 6.6 TD V8 (445 Hp) 4WD DRW Automatic & GMC Sierra 3500HD V (GMTT1XX) Regular Cab Long Bed 6.6 Duramax TD V8 (445 Hp) 4WD SRW Automatic & GMC Sierra HD Double Cab Long Box 2500 6.0 V8 (360 Hp) 4WD SRW Automatic
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| Brand: | GMC | GMC | GMC |
| Model: | Sierra 2500HD | Sierra 3500HD | Sierra 2500HD |
| Generation: | Sierra HD Regular Cab Long Box | Sierra 3500HD V (GMTT1XX) Regular Cab Long Bed | Sierra HD Double Cab Long Box |
| Engine / modification: | 3500 6.6 TD V8 (445 Hp) 4WD DRW Automatic | 6.6 Duramax TD V8 (445 Hp) 4WD SRW Automatic | 2500 6.0 V8 (360 Hp) 4WD SRW Automatic |
| Production start: | 2018 year | 2020 year | 2018 year |
| Production end: | 2023 year | ||
| Coupe type: | Pick-up | Pick-up | Pick-up |
| Powertrain Architecture: | Internal Combustion engine | ||
| Num. of Doors: | 2 | 2 | 4 |
| Num. of seats: | 2 | 2 | 5 |
| Fuel Type: | Diesel | Diesel | Petrol (Gasoline) |
| Fuel tank volume: | 136 l | 106 l | 136 l |
| Power: | 445 hp | 445 hp | 360 hp |
| Max power in: | 2800 rpm. | 2800 rpm. | 5400 rpm. |
| Torque: | 1234 Nm @ 1600 rpm. | 1234 Nm @ 1600 rpm. | 515 Nm @ 4200 rpm. |
| Model Engine: | DURAMAX L5P | Duramax L5P | VORTEC |
| Engine position: | Front, longitudinal | Front, longitudinal | |
| Engine displacement: | 6588 cm3 | 6604 cm3 | 5965 cm3 |
| Engine oil capacity: | 9.5 l | 9.5 l | 5.7 l |
| Coolant: | 29.1 l | 16.1 l | |
| Fuel System: | Diesel Commonrail | Multi-point injection | |
| Aspiration / Turbine: | Turbocharger | ||
| Position of cylinders: | V engine | V engine | |
| Valvetrain: | OHV | VVT | |
| Number of cylinders: | 8 | 8 | 8 |
| Number of valves per cylinder: | 4 | 4 | 2 |
| Compression ratio: | 16 | 16 | 9.7 |
| Piston Stroke: | 99 mm | 99 mm | 92 mm |
| Cylinder Bore: | 103 mm | 103 mm | 101.6 mm |
| Wheel Drive: | All wheel drive (4x4) | All wheel drive (4x4) | All wheel drive (4x4) |
| Number of Gears (automatic transmission): | 6 | 6 | |
| Length: | 5700 mm | 5982 mm | 6322 mm |
| Width including mirrors: | 2035 mm | 2076 mm | 2045 mm |
| Height: | 1963-1979 mm | 2056 mm | 1978 mm |
| Wheelbase: | 3393 mm | 3595 mm | 4017 mm |
| Front track: | 1731 mm | ||
| Rear (Back) track: | 1736 mm | ||
| Ride height(clearance): | 285 mm | ||
| Maximum amount of Luggage (trunk): | 2160 l | 2160 l | |
| Front suspension: | Torsion | Torsion | |
| Rear suspension: | The spring | The spring | |
| Max weight: | 5908 kg | 5352 kg | 4309 kg |
| Front brakes: | Ventilated discs | Ventilated discs | |
| Rear brakes: | Ventilated discs | Ventilated discs | |
| Kerb Weight: | 3422 kg | 2954 kg | |
| ABS: | yes | yes | |
| Steering type: | Steering rack and pinion | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | Electric Steering | Electric Steering |
| Permitted trailer load with brakes (12%): | 9072 kg | 6577 kg | 6396 kg |
| Tire size: | 245/75 R17; 265/70 R17; 265/70 R18; 265/60 R20 | 265/70 R17; 245/75 R17; 265/70 R18; 265/60 R20 | 235/80 R17; 265/70 R18; 265/60 R20 |
| Wheel rims size: | 7J x 17; 7.5J x 17; 8J x 18; 8J x 20 | 7.5J x 17; 8J x 18; 8.5J x 20 | 6.5J x 17; 8J x 18; 8J x 20 |