The 2005 Chevrolet Silverado 2500HD 4 Dr Work Truck 2WD Crew Cab SB HD has a 6.0 L, 300 hp V8 engine with standard 5 speed manual transmission.  This trim has 4 doors, seats 6, and has standard air conditioning and ABS brakes.  Cd player comes as an option.  Towing capacity maxes out at 15600 lbs.