The 2006 Chevrolet Silverado 2500HD Work Truck 4dr Extended Cab LB 4WD has a 6.0 L, 300 hp V8 engine 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.  Towing capacity maxes out at 15400 lbs.