This
calculator may help you in your quest for the "Perfect Rear End Ratio"
Note:- We are not responsible for any potential errors. Always verify calculations before making changes and driving your vehicle!
*Engine RPM should be measured in direct drive, this is usually the highest non-overdrive gear. In automatics with non-lock-up torque convertors, convertor slippage will result in additional errors, this can be minimized by measuring the RPM during light cruise to near coast conditions.
