Dear Peeps of the Mercedes world. I am just about to buy a nice Merc J reg 190 2.0 looks like a 190e, very quiet and clean, obviously old. On returning from a very local run of about 2 miles tops (to get some fuel from a garage) I noticed a smooth quiet whine coming from the rear diff. I even selected neutral just to coast for a few yards, it remained. I mentioned this to the dealer who is going to give the . . diff people at his suppliers a call and will get back to me. I am sure it is the diff as it was too consistent to be the wheel bearings (but I could be wrong, but I don`t think I am) In short, how much would a rear diff replacement be without replacing it with an equally noisy diff? And, if I may . . where would one go to to find a lovely diff, please? Apart from that it looked fine. The auto trans fluid was either very, very, clean, or non existent ( I know!) The auto trans sounded fine with no noise or jumpiness from the change up or down. I would rather attack the diff prob a.s.p. now rather than it sit on its a--e end on the hard shoulder. Any input would be much appreciated, and, thank you for being here.