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This calculator will assist you in determining the ratio between the ring gear and pinion gear in the differential housing in the rear end axle of a vehicle.

The rear end axle is responsible for transmitting power to the rear wheels in a rear wheel drive vehicle. The calculation uses the number of teeth in the ring gear and divides it by the number of teeth in the pinion gear, to provide you with a result to 1 ratio.

For example, if the pinion gear has 41 teeth, and the ring gear has 11 teeth, the ratio would be calculated as 41/11 which = 3.73 so 3.73:1.