The rear of the ML has become very whiny. I use my ML to pull a fairly large trailer and am guessing that may have accelerated the wear.

I read that MB rear differentials are very well built but there are a lot of miles on the one in my ML (185K) and about 15K recently miles pulling a trailer.

Don't know how to troubleshoot it but recently replaced the drive shaft bearing and a bad axle but those did not solve the whine, which occurs most pronounced at modest acceleration and can be heard at 20 MPH or over.

__________________
Toyota is a leader only because their drivers block everyone behind them. Oh what a feeling.