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28K on the clock is nothing. The CV type boots aren't torn? Are you getting a loss of rear end gear oil from one of the seals? You stated a "clunk" type sound which does sound like the half-shafts, which by the way are a lot cheaper that $600 per side, although I'm not talking about labor, rather parts only. If you were hearing a click type sound then there is an easy fix for that. Have you checked the torque on the axle shaft nuts (33mm)?