I always understood overdrive to mean one of two things:
1. A gear ration higher than 1:1. This has already been mentined.
2. On an old Jeep, it is pretty common to find a Warn All Range Overdirve. This contraption doubles the number of gears, bot forward and revers, by adding a gear inbetween all of the other gears.
Having said this, I believe that the main topic here is with regard to overdirve with an automatic transmission, not a manual transmission as the old Jeeps had.
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