final drive ratio

This is the ratio that describes the difference between the number of times the driveshaft must turn before the axle shaft turns once. In a final drive ratio of 3.55:1, for example, the driveshaft must turn 3.55 times before the axle will turn once. The number of teeth on the ring and pinion gears determine the ratio. In most instances, the ratio is not a simple number like 3.00:1 because the same teeth on the drive and driven gears would always meet and cause wear.

Dictionary of automotive terms. 2015.

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