### Differential Gear Ratio Calculator

Enter the maximum potential safe engine RPM. Enter the tire size diameter and the target vehicle speed in MPH. Click “Calculate Differential Gear Ratio”. The value will be returned in estimated differential gear ratio, based on the entered values. [Read More…]

### How To Select Proper Rear-End / Differential Gear Ratio

A number of factors must be considered when selecting a rear-end gear ratio (ring & pinion set). Tire diameter, transmission choice (with or without overdrive) and desired highway cruising speed. [Read More…]

### Speed Potential Calculator for Ring Gear and Pinion Changes

This calculator is designed to give the potential speed values of a vehicle, based on the RPM of the engine, the ring gear and pinion gear ration, the final transmission gear ration (usually 1.00) and the tire diameter, ground to top of tire as mounted. [Read More…]

### Rear-End Widths of Classic American Cars

Rear-End Widths of Classic American Cars including Chevy, Ford, and Mopar. [Read More…]

### Understanding Differential Gears

I got into a discussion some time ago about welding a rear-end on a street vehicle – It became clear that the guy I was discussing this with did not fully understand how a differential works. This video was made in the 1930’s or so and is the best explanation I have seen to date. [Read More…]

### Axle Flange Housing Identification

Axle Flange Housing Identification. Chevrolet, Ford, Oldsmobile, Pontiac — they all use different axle flanges. The ability to identify the flange you have can save time and hassle when it comes time to buy parts. Use the figure below to help identify some of the more common axle flanges… [Read More…]

### Differential Identification Chart

Your differential is the set of gears that allows your vehicle’s driven wheels to revolve at different speeds by splitting your engine torque in two directions. This differential ID chart shows AMC, Chrysler, Dana, Ford, and GM differentials. [Read More…]