Part Notes: 2 Wheel Drive, 2500 & 3500 W/11.5 Axle, W/Anti-Spin, W/O Dual Rear Wheels, 4.10 Ratio;Mega Cab, 2 Wheel Drive, 4.10 Ratio, W/Anti-Spin, 3500;Regular/Quad Cab, 2 Wheel Drive, 2500 & 3500 W/11.5 Axle, W/Anti-Spin, W/O Dual Rear Wheels, 4.10 Ratio