Looking for a differential for your Dually Cab & Chassis? Have a box truck, grain truck or dump truck and need a tough, professionally re-manufactured differential that you and your business can depend on? National Differential is your answer! We have over 30 years of professionally re-manufacturing and rebuilding heavy duty differentials for Dual Rear Wheel truck applications. Don't worry if you don't see exactly what you need, just contact us and we can build exactly what you need.