I've mentioned in previous posts about a noise in the rear end of my 85 300SD. I took it to a mechanic I know and trust and he thinks the problem is the carrier bearings(sp?) in the differential. He said I should have that fixed/rebuilt or I would have to get another differential if I continue to drive the car. I also think it may be one of those deals that it stays loud but never fails completely. I need opinions on what I should do. This will be an expensive repair to say the least. The car still runs well and still looks good. Not to many other problems with it. But more failures are sure to come to a car of this age. This car has been in my family since 1991. Thank you for any input.

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1985 Mercedes Benz 300SD, TMU
2015 Chrysler 200S