Until you get one with bad contact and its noisy under decelleration due to odd wear from the front:p
But if it was quite in the front, it'll be quite in the rear.....plus standard rover diffs dont last long, so you'll change it soon enough anyhow:D
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So if Iswap the diff centres around in my D1 it will reduce the backlash? My friend was a Mechanic and he use to swap CV's from side to side to get more milage out of them.