All you have to do is raise the car and inspect the flex discs to rule that out.

If they show ANY cracks or threads showing you should replace them.

It's not that hard as long as you remember to mark the shaft coming from the transmission and the drive shaft so you will know how to put them back together exactly.

You loosen the nut on the drive shaft and slide it off the tranny.

You may have to loosen the rear flex disc from the rear end and loosen the bolts on the carrier bearing to give you enough room to slide it off the tranny.

I also remember having to detach the muffler hangers to give me more room to work.

I loosened them and then placed an old gas can under it to support the exhaust since I didn't need the room created when the whole thing sagged to the ground.

I also had the car up on jack stands all the way around at this time.

It's not really a hard job if you do find that they are the problem.

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1993 W124 300D
-297K on the clock as I type this.