Part Notes: 4 Wheel Drive, 4.10 Ratio, With Anti-Spin, 2500;4 Wheel Drive, With 11.5 Axle, With Anti-Spin, Without Dual Rear Wheels, 4.10 Ratio;Mega Cab, 4 Wheel Drive, 4.10 Ratio, With Anti-Spin, 2500;Regular/Quad Cab, 4 Wheel Drive, With 11.5 Axle, With Anti-Spin, Without Dual Rear Wheels, 4.10 Ratio