Part Notes: 2 Wheel Drive, 2500 & 3500 W/11.5 Axle, W/O Anti-Spin, Dual Rear Wheels, 3.73 Ratio;2 Wheel Drive, 3.73 Ratio, W/O Anti-Spin, 3500;Mega Cab, 2 Wheel Drive, 3.73 Ratio, W/O Anti-Spin, 3500;Regular/Quad Cab, 2 Wheel Drive, 2500 & 3500 W/11.5 Axle, W/O Anti-Spin, Dual Rear Wheels, 3.73 Ratio