Part Notes: 2 Wheel Drive, 2500 & 3500 With 11.5 Axle Without Dual Rear Wheels, 3.42 Ratio;2 Wheel Drive, 3500 With 11.5 Axle With Dual Rear Wheels, 3.42 Ratio;2 Wheel Drive, 3500 With 11.5 Axle With Dual Rear Wheels, 4.10 Ratio;4 Wheel Drive, 2500 & 3500 With 11.5 Axle Without Dual Rear Wheels, 3.42 Ratio;4 Wheel Drive, 3500 With 11.5 Axle With Dual Rear Wheels, 3.42 Ratio