Hi, I'm replacing my drive shaft support bearing and support bracket as part of other work I'm doing on my W123. I noticed that the driveshaft U-joint is sticky what seems to be in the perfect center of the joints.

And by sticky I mean if I move the parts around - they are smooth until it centers, then it feels like the joint is falling into a groove of some sort. This is the same for all 4 directions of movement.

Does anyone know if this is the special design of the U-joint or a really bad wear? The old bearing was pretty lose and noisy - could have been original from 1982. The support bracket rubber was completely torn up.

Thanks.