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So FWD transmissions have an input shaft that you choose gears from that to the main shaft which is geared to the ring gear on the differential. So a 1:1 gearing would still turn the same amount of shafts and still send the power through the same number of gears.
UNLESS, you had a chain drive going from the input shaft to the differential. But then the question would be if a chain drive could be just as efficient as going through gears. The main shaft would also still be spining unless you could disconnect the final gear that goes to the ring gear. Not to mention, it would just be more complicated.
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