My guess is that your problem is in the drive shaft area.

These cars have a driveline that has flexible rubber discs at both ends (called flex discs) instead of a traditional U-joint, and a center U-joint with a support bearing.

Further, the front flex disc usually wears out, and is probably shot if it hasn't been replaced already, too.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".