An automobile's differential gear (often abbreviated "diff", and most commonly referred to as the "differential") is a device which, potentially among other things, allows the wheels to be driven at different speeds. In a turn, the wheels (all of them, but we are currently interested in those which are driven, meaning that power is applied to the road or other surface through them) travel different distances in the same period of time, so this is important. Generally speaking, nearly every car needs a differential of some sort.

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