- An overdrive device which is not original equipment, but has been added after it has been sold.
Dictionary of automotive terms. 2015.
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overdrive —  A unit with a planetary gearset which turns the driveshaft faster than the transmission output shaft.  An additional gearbox which is mounted in the driveline. Normally the final drive ratio is 1:1; but the overdrive makes it less (e.g., 0 … Dictionary of automotive terms
Overdrive (mechanics) — For other uses, see Overdrive. An overdrive is sometimes a separate unit that fits into the back of a gearbox, as with this Fairey unit. A plate warns to only engage the unit in third and fourth gears … Wikipedia
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