I recently read in one of the forums that you snug up but do not tighten that Drive Shaft Coupling Nut (46 or 47mm) put the Car back down on the Wheels and roll the Car Back and forth to settle the drive shaft in the Coupling and then tighten it up.

I cannot recall if it had to be in gear or not but the Member said the proceedure was in the W115 Manual.

But, you said it resonates when is not moving.

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84 300D, 82 Volvo 244Gl Diesel