The 2006 Chevrolet Silverado 2500HD Work Truck 4dr Crew Cab 4WD SB has a 6.0 L, 300 hp V8 powertrain with standard 5 speed manual transmission.  This trim has 4 doors, seats 6, and offers standard air conditioning and ABS brakes.  Cd player comes as an option.  Finally, towing capacity maxes out at 15300 lbs.