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By flushing do you mean adding some sort of cleaning additive, sort of flush chemicals? I agree but it dirt is holding the part together, I just change the fluid in the diffs and gearbox a couple of times and do it after a long run so the oil has been circulating. Also leaving the oil to drain as long as possible.
lynx
@IR from my experience don't flush anything, just change the fluids. Often there's some crap holding everything together in an aged gearbox or diff and flushing it will just kill it rather than saving it.