The diff has 3 mounting points - 2 to the rear but only 1 at the front. The front one often chews out the rubber and can cause a knocking sound when changing down gears. If it is this, the whole front mount will have to be replaced - not a big deal.
As it is relatively easy to check - check this first before the hard stuff like bearings, drive shafts, CVs etc.
Garry
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