Comparison GMC Sierra 3500HD V (GMTT1XX) Double Cab Long Bed 6.6 Duramax TD V8 (445 Hp) 4WD SRW Automatic & GMC Sierra 2500HD V (GMTT1XX, facelift 2024) Crew Cab Standard Bed 6.6 V8 (401 Hp) 4WD Automatic
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| Brand: | GMC | GMC |
| Model: | Sierra 3500HD | Sierra 2500HD |
| Generation: | Sierra 3500HD V (GMTT1XX) Double Cab Long Bed | Sierra 2500HD V (GMTT1XX, facelift 2024) Crew Cab Standard Bed |
| Engine / modification: | 6.6 Duramax TD V8 (445 Hp) 4WD SRW Automatic | 6.6 V8 (401 Hp) 4WD Automatic |
| Production start: | 2020 year | 2023 year |
| Production end: | 2023 year | |
| Coupe type: | Pick-up | Pick-up |
| Powertrain Architecture: | Internal Combustion engine | Internal Combustion engine |
| Num. of Doors: | 4 | 4 |
| Num. of seats: | 5 | 5 |
| Fuel Type: | Diesel | Petrol (Gasoline) |
| Fuel tank volume: | 136 l | 136 l |
| Power: | 445 hp | 401 hp |
| Max power in: | 2800 rpm. | 5200 rpm. |
| Torque: | 1234 Nm @ 1600 rpm. | 629 Nm @ 4000 rpm. |
| Model Engine: | Duramax L5P | L8T |
| Engine displacement: | 6604 cm3 | |
| Engine oil capacity: | 9.5 l | 7.6 l |
| Coolant: | 29.1 l | 14.6 l |
| Aspiration / Turbine: | Naturally aspirated engine | |
| Valvetrain: | OHV | OHV |
| Number of cylinders: | 8 | 8 |
| Number of valves per cylinder: | 4 | 2 |
| Compression ratio: | 16 | 10.8 |
| Piston Stroke: | 99 mm | 98 mm |
| Cylinder Bore: | 103 mm | 103.25 mm |
| Wheel Drive: | All wheel drive (4x4) | All wheel drive (4x4) |
| Length: | 6514 mm | 6369 mm |
| Width including mirrors: | 2079 mm | 2079 mm |
| Height: | 2054 mm | 2027 mm |
| Wheelbase: | 4127 mm | 4037 mm |
| Front track: | 1731 mm | 1731 mm |
| Rear (Back) track: | 1736 mm | 1736 mm |
| Ride height(clearance): | 284 mm | 257 mm |
| Front suspension: | Independent torsion bar, double wishbone | |
| Max weight: | 5511 kg | 4740 kg |
| Kerb Weight: | 3612 kg | 3178 kg |
| Steering type: | Steering rack and pinion | Cone worm with recirculation balls |
| Power steering: | Electric Steering | Hydraulic Steering |
| Permitted trailer load with brakes (12%): | 6577 kg | 7257 kg |
| Tire size: | 265/70 R17; 245/75 R17; 265/70 R18; 265/60 R20 | 245/75 R17; 265/70 R17; 275/70 R18; 275/65 R20 |
| Wheel rims size: | 7.5J x 17; 8J x 18; 8.5J x 20 | 7.5J x 17; 8J x 18; 8.5J x 20 |