Comparison GMC Sierra 1500 III (GMT900) Extended Cab Long Box 5.3 Vortec V8 (320 Hp) 4WD Automatic FlexFuel & GMC Sierra 2500HD III (GMT900, facelift 2011) Regular Cab Long Box 6.6 Duramax TD V8 (397 Hp) 4WD Automatic
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| Brand: | GMC | GMC |
| Model: | Sierra 1500 | Sierra 2500HD |
| Generation: | Sierra 1500 III (GMT900) Extended Cab Long Box | Sierra 2500HD III (GMT900, facelift 2011) Regular Cab Long Box |
| Engine / modification: | 5.3 Vortec V8 (320 Hp) 4WD Automatic FlexFuel | 6.6 Duramax TD V8 (397 Hp) 4WD 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: | 6 | 2 |
| Fuel consumption / economy - urban: | 16.8 l/100 km | |
| Fuel consumption / economy - extra urban: | 12.4 l/100 km | |
| Fuel Type: | Petrol / Ethanol - E85 | Diesel |
| Fuel tank volume: | 128 l | 136 l |
| Power: | 320 hp | 397 hp |
| Max power in: | 5200 rpm. | 3000 rpm. |
| Torque: | 461 Nm @ 4200 rpm. | 1037 Nm @ 1600 rpm. |
| Model Engine: | LMG | Duramax LML |
| Engine displacement: | 5328 cm3 | 6599 cm3 |
| Engine oil capacity: | 5.7 l | 9.5 l |
| Coolant: | 14.1 l | 24 l |
| Maximum engine speed: | 6000 rpm. | 3000 rpm. |
| Aspiration / Turbine: | Naturally aspirated engine | |
| Valvetrain: | OHV | OHV |
| Number of cylinders: | 8 | 8 |
| Number of valves per cylinder: | 2 | 4 |
| Compression ratio: | 9.9 | 16 |
| Piston Stroke: | 91.95 mm | 99 mm |
| Cylinder Bore: | 96.01 mm | 103 mm |
| Wheel Drive: | All wheel drive (4x4) | All wheel drive (4x4) |
| Length: | 6325 mm | 5715 mm |
| Width including mirrors: | 2029 mm | 2032 mm |
| Height: | 1868 mm | 1971 mm |
| Wheelbase: | 4001 mm | 3369 mm |
| Front track: | 1730 mm | 1748 mm |
| Rear (Back) track: | 1702 mm | 1709 mm |
| Ride height(clearance): | 240 mm | 231 mm |
| Approach angle: | 16.4 ° | |
| Departure angle: | 22 ° | |
| Maximum amount of Luggage (trunk): | 2138 l | 2138 l |
| Front suspension: | Independent torsion bar, double wishbone | |
| Max weight: | 3175 kg | 4491 kg |
| Kerb Weight: | 2496 kg | 3094 kg |
| Steering type: | Steering rack and pinion | Cone worm with recirculation balls |
| Power steering: | Electric Steering | |
| Minimum turning circle (turning diameter): | 15.6 m | 13.7 m |
| Permitted trailer load with brakes (12%): | 4173 kg | 5897 kg |
| Tire size: | 245/70 R17 | 245/75 R17; 265/70 R17; 265/70 R18; 265/60 R20 |
| Wheel rims size: | 7.5J x 17 | 7.5J x 17; 8J x 18; 8.5J x 20 |