Have you had the wheels balanced since you got the car? I'd knock out the simple stuff before pulling the drive shaft to do a bearing replacement that may not be needed, though that procedure is not too tough.

If you do pull the drive shaft be sure to mark the two halves so you can get them back together the way they were before. Otherwise you'll throw off the balance of the drive shaft assembly and have yet another vibration!

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- Greg -
1973 220D, The Prodigal Benz
1974 240D