Hi, A while ago I was asking for help from this ng with a problem of noise in my
1991 300E. It started last October, and would come and go. It stopped making the noise 3 times on my way to the shop. Once in the driveway of the dealership!
It turned out to be the rear axel. It's been working fine ever since a replacement was installed. Prior to that I replaced the flex disks hoping against hope they were somehow causing the noise.
The only clue to this, other than the noisy thumping, was a little lateral play in the axel. The other one had no lateral play in it at all. And I mean a little, as in about an eighth of an inch.
Just thought I'd post an update to let you know the resolution, and to thank once again, those who were kind enough to post replies to my inquiry.
Sammy