Comparison GMC Sierra HD Double Cab Long Box 2500 6.6 TD V8 (445 Hp) 4WD SRW Automatic & GMC Sierra 3500HD III (GMT900, facelift 2011) Extended Cab Long Box 6.6 Duramax TD V8 (397 Hp) 4WD DRW Automatic
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| Brand: | GMC | GMC |
| Model: | Sierra 2500HD | Sierra 3500HD |
| Generation: | Sierra HD Double Cab Long Box | Sierra 3500HD III (GMT900, facelift 2011) Extended Cab Long Box |
| Engine / modification: | 2500 6.6 TD V8 (445 Hp) 4WD SRW Automatic | 6.6 Duramax TD V8 (397 Hp) 4WD DRW Automatic |
| Production start: | 2018 year | 2011 year |
| Production end: | 2013 year | |
| Coupe type: | Pick-up | Pick-up |
| Powertrain Architecture: | Internal Combustion engine | |
| Num. of Doors: | 4 | 2 |
| Num. of seats: | 5 | 5 |
| Fuel Type: | Diesel | Diesel |
| Fuel tank volume: | 136 l | 136 l |
| Power: | 445 hp | 397 hp |
| Max power in: | 2800 rpm. | 3000 rpm. |
| Torque: | 1234 Nm @ 1600 rpm. | 1037 Nm @ 1600 rpm. |
| Model Engine: | DURAMAX L5P | Duramax LML |
| Engine position: | Front, longitudinal | |
| Engine displacement: | 6588 cm3 | 6599 cm3 |
| Engine oil capacity: | 9.5 l | 9.5 l |
| Coolant: | 24 l | |
| Fuel System: | Diesel Commonrail | |
| Maximum engine speed: | 3000 rpm. | |
| Aspiration / Turbine: | Turbocharger | |
| Position of cylinders: | V engine | |
| Valvetrain: | OHV | |
| Number of cylinders: | 8 | 8 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 16 | 16 |
| Piston Stroke: | 99 mm | 99 mm |
| Cylinder Bore: | 103 mm | 103 mm |
| Wheel Drive: | All wheel drive (4x4) | All wheel drive (4x4) |
| Number of Gears (automatic transmission): | 6 | |
| Length: | 6322 mm | 6337 mm |
| Width including mirrors: | 2045 mm | 2436 mm |
| Height: | 1978 mm | 1966 mm |
| Wheelbase: | 4017 mm | 4018 mm |
| Front track: | 1748 mm | |
| Rear (Back) track: | 1906 mm | |
| Ride height(clearance): | 213 mm | |
| Maximum amount of Luggage (trunk): | 2160 l | 2138 l |
| Front suspension: | Torsion | Independent torsion bar, double wishbone |
| Rear suspension: | The spring | |
| Max weight: | 4536 kg | 5908 kg |
| Front brakes: | Ventilated discs | |
| Rear brakes: | Ventilated discs | |
| Kerb Weight: | 3376 kg | 3501 kg |
| ABS: | yes | |
| Steering type: | Steering rack and pinion | Cone worm with recirculation balls |
| Power steering: | Electric Steering | |
| Minimum turning circle (turning diameter): | 16.1 m | |
| Permitted trailer load with brakes (12%): | 6577 kg | 8165 kg |
| Tire size: | 245/75 R17; 265/70 R17; 265/70 R18; 265/60 R20 | 235/80 R17; 265/70 R18 |
| Wheel rims size: | 7J x 17; 7.5J x 17; 8J x 18; 8J x 20 |