Part Notes: 2 Wheel Drive, 2500 & 3500 With 11.5 Axle, With Anti-Spin, Without Dual Rear Wheels, 4.10 Ratio;2 Wheel Drive, 4.10 Ratio, With Anti-Spin, 3500;Mega Cab, 2 Wheel Drive, 4.10 Ratio, With Anti-Spin, 3500;Regular/Quad Cab, 2 Wheel Drive, 2500 & 3500 With 11.5 Axle, With Anti-Spin, Without Dual Rear Wheels, 4.10 Ratio