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well i must say the only reason i opened this topic is because i wasnt sure why you were asking about a dana 40.....lol at any rate, i agree with tj, suck it out with a vaccum pump, its a gravy job. in my opinion the only way you will damage a dana 50 is to run it out of oil or excessively wheel hop it. other then that i see no reason for a tear down just to inspect it.
what do you mean by "its a bit loud"? and the only way to check the u joints is to remove the axles and check them, my money is on the joints are trashed, not the center section.
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