Comparison GMC Sierra 2500HD III (GMT900) Extended Cab Long Box 6.6 Duramax TD V8 (365 Hp) 4WD Automatic & GMC Sierra 3500HD III (GMT900, facelift 2011) Regular 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 2500HD III (GMT900) Extended Cab Long Box | Sierra 3500HD III (GMT900, facelift 2011) Regular Cab Long Box |
| Engine / modification: | 6.6 Duramax TD V8 (365 Hp) 4WD Automatic | 6.6 Duramax TD V8 (397 Hp) 4WD DRW Automatic |
| Production start: | 2007 year | 2011 year |
| Production end: | 2010 year | 2014 year |
| Coupe type: | Pick-up | Pick-up |
| Powertrain Architecture: | Internal Combustion engine | Internal Combustion engine |
| Num. of Doors: | 2 | 2 |
| Num. of seats: | 5 | 2 |
| Fuel Type: | Diesel | Diesel |
| Fuel tank volume: | 129 l | 136 l |
| Power: | 365 hp | 397 hp |
| Max power in: | 3200 rpm. | 3000 rpm. |
| Torque: | 895 Nm @ 1600 rpm. | 1037 Nm @ 1600 rpm. |
| Model Engine: | Duramax LMM | Duramax LML |
| Engine displacement: | 6599 cm3 | 6599 cm3 |
| Engine oil capacity: | 9.5 l | 9.5 l |
| Coolant: | 24 l | 24 l |
| Maximum engine speed: | 3450 rpm. | 3000 rpm. |
| Valvetrain: | OHV | OHV |
| Number of cylinders: | 8 | 8 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 16.8 | 16 |
| Piston Stroke: | 99 mm | 99 mm |
| Cylinder Bore: | 103 mm | 103 mm |
| Wheel Drive: | All wheel drive (4x4) | All wheel drive (4x4) |
| Length: | 6330 mm | 5715 mm |
| Width including mirrors: | 2436 mm | 2436 mm |
| Height: | 1930 mm | 1966 mm |
| Wheelbase: | 4001 mm | 3369 mm |
| Front track: | 1744 mm | 1748 mm |
| Rear (Back) track: | 1676 mm | 1906 mm |
| Ride height(clearance): | 243 mm | 218 mm |
| Maximum amount of Luggage (trunk): | 2138 l | 2138 l |
| Front suspension: | Independent torsion bar, double wishbone | Independent torsion bar, double wishbone |
| Max weight: | 4173 kg | 5908 kg |
| Kerb Weight: | 3036 kg | 3304 kg |
| Steering type: | Cone worm with recirculation balls | Cone worm with recirculation balls |
| Minimum turning circle (turning diameter): | 16 m | 13.9 m |
| Permitted trailer load with brakes (12%): | 5897 kg | 7258 kg |
| Tire size: | 245/75 R16; 265/75 R17 | 235/80 R17; 265/70 R18 |
| Wheel rims size: | 6.5J x 16; 7.5J x 17 |