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bought a 1997 B4000 with 120k miles. Rear end made grinding noise when moving from standstill, sepecially if turning sharply during startup. Also made clunk when stepping on gas and sometimes when breaking when the nearly stopped. Used car dealer said someone put in gear oil without proper friction additive. He put some in and grinding noise has gone away (except on very rare occasions), but clunk remains. Is this clunk indicating differental repair is needed? Dealer promised to fix the noise if it returned.