I recently had the transmission rebuilt in my 1980 300CD. The transmission shop called me right after they had the trans back into the car. At that time they said that my driveshaft center support needed replacement. I thought they replaced both the rubber support and the bearing. However, I looked under the car and it appears that the rubber support has been replaced but the bearing is original because it has a torn dust boot.
At low speed I'm getting a rumble or shutter which seems to be coming from under the center of the car. It's worse on harder acceleration or going up hills. Could it be a worn center support bearing? I don't know if the transmission shop reassembled the two halfs of the driveshaft correctly? Are the two halfs marked after being factory balanced? BTW both flex discs have been replaced along with both rear axle half shafts (with new parts). The car has 270,000+ miles on it (63,000 miles since I rebuilt the engine). Everything but the center support dust boot looks fine under the car but I still have the vibration. Any Mercedes mechanics out there with suggestions.