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Sounds very much like the rubber mount for the center drive shaft bearing is old and hard, or shrunk. If you can move the driveshaft inside the rubber by pulling on it more than a very slight amount, replace the mount. Bearing can be bad too, but it usually hisses or growls rather than vibrating.
What happens is that under high torque, the driveshaft can go slightly off center if the rubber allows too much movement, and so it orbits rather than spins. When you release the torque, it spins straight again.
Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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