Drive Shaft Banging Floor
 

I have a 85 380SE. It will bang the floor board with the drive shaft I think when I excellerate full throttle and it shifrs to 2nd gear. Or when people are in the back seat. With normal or maintain speed on interstate. I replaced center bearing and support, and transmission mount. That only helped a little. This fixed my TD when it started this. Could it be my rearend mounts.
I am a little lost right now on this one. Thanks

Different chassis, but replacing the bearings in the U-joint helped to get rid of this in my 300E. On my car, the driveshaft was rubbing on a crossmember under the car.

This was after replacing the center support and the tranny mount.

The only other things I can think of that would affect driveline alignment would be motor mounts and differential mounts.

You have a bad center bearing support. If you DIY, be sure to mark your driveshaft so you get the pieces back together with the same alignment. They are balanced.

I did replace the center support and the tranny mount it only helped a little. Any other suggestions. Or maybe I got a bad support. It was not an MB part aftermarket. Thought tat this would be ok to use. Did use MB tranny mount though.