Comparison GMC Sierra 3500HD III (GMT900) Extended Cab Long Box 6.6 Duramax TD V8 (365 Hp) SRW Automatic & GMC Sierra 2500HD V (GMTT1XX) Double Cab Standard Bed 6.6 Duramax TD V8 (445 Hp) 4WD Automatic
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| Brand: | GMC | GMC |
| Model: | Sierra 3500HD | Sierra 2500HD |
| Generation: | Sierra 3500HD III (GMT900) Extended Cab Long Box | Sierra 2500HD V (GMTT1XX) Double Cab Standard Bed |
| Engine / modification: | 6.6 Duramax TD V8 (365 Hp) SRW Automatic | 6.6 Duramax TD V8 (445 Hp) 4WD Automatic |
| Production start: | 2007 year | 2020 year |
| Production end: | 2010 year | 2023 year |
| Coupe type: | Pick-up | Pick-up |
| Powertrain Architecture: | Internal Combustion engine | Internal Combustion engine |
| Num. of Doors: | 2 | 4 |
| Num. of seats: | 5 | 5 |
| Fuel Type: | Diesel | Diesel |
| Fuel tank volume: | 129 l | 111 l |
| Power: | 365 hp | 445 hp |
| Max power in: | 3200 rpm. | 2800 rpm. |
| Torque: | 895 Nm @ 1600 rpm. | 1234 Nm @ 1600 rpm. |
| Model Engine: | Duramax LMM | Duramax L5P |
| Engine displacement: | 6599 cm3 | 6604 cm3 |
| Engine oil capacity: | 9.5 l | 9.5 l |
| Coolant: | 24 l | 29.1 l |
| Maximum engine speed: | 3450 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: | Rear wheel drive | All wheel drive (4x4) |
| Length: | 6330 mm | 6107 mm |
| Width including mirrors: | 2436 mm | 2079 mm |
| Height: | 1931 mm | 2031 mm |
| Wheelbase: | 4001 mm | 3795 mm |
| Front track: | 1742 mm | 1731 mm |
| Rear (Back) track: | 1676 mm | 1736 mm |
| Ride height(clearance): | 233 mm | 259 mm |
| Maximum amount of Luggage (trunk): | 2170 l | |
| Front suspension: | Independent torsion bar, double wishbone | |
| Max weight: | 4400 kg | 4990 kg |
| Kerb Weight: | 2983 kg | 3441 kg |
| Steering type: | Cone worm with recirculation balls | Steering rack and pinion |
| Power steering: | Electric Steering | |
| Minimum turning circle (turning diameter): | 16 m | |
| Permitted trailer load with brakes (12%): | 5897 kg | 6577 kg |
| Tire size: | 265/75 R16; 265/70 R17; 225/75 R17 | 235/80 R17; 265/70 R17; 245/75 R17; 265/70 R18; 265/60 R20 |
| Wheel rims size: | 6.5J x 17; 7J x 16; 7.5J x 17 | 7.5J x 17; 8J x 18; 8.5J x 20 |