Anyway to test the u-joint? When I originally thought the problem was the center support I jacked up the car and checked it, but it was still intact and no torn rubber. Could it be the bearing in the center support? Not sure what a failing center support bearing would sound like. FYI Center support bearing and rubber was replaced 6/2018, not sure if that makes a difference or not in relation to the durability of the new parts withstanding streess from a worn part vs if the center support was a few years old.

__________________

1990 190E 3.0L