Quote:
Originally Posted by Racer Boy
You are right, there is a reason why that isn't done. You'd also have to change the ring gear if you change the pinion gear (they have to mesh to each other; if you change the ratio, you change the number of teeth, and no more meshing of gears).
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Changing the ring gear is a piece of cake. I think it's pretty much understood that if you change the pinion gear you also have to change the ring gear. That in itself is not a reason why the pinion gear isn't easily swappable.