today at work i changed my rear differential fluid just for the hell of it, damn when i pulled that plug it had so many metal shavings on it i didnt know what to do with myself. i cleaned the plug off and flushed maybe 5 quarts of GL-5 80w90 through it to clean it up, then filled it. the grinding quieted down but is still there, its more of a hum almost sounds like grinding rotors.. my diff is probably on its way out. do you think that the speedo cable broke? or the sending unit. also i noticed the rear end clunks when you put it into gear (its an auto) how do you run a diagnostic on the tranny?
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