The 2006 Chevrolet Silverado 2500HD LS 4dr Extended Cab 4WD LB 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, cd player, and ABS brakes.  Towing capacity maxes out at 15400 lbs.