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Although not on a 928, I had identical symptoms after a repair shop replaced the clutch on a 1967 Ferrari 330 for me. Problem was solved by balancing the driveshaft and taking care of an alignment problem somewhere in the driveline. Unfortunately, by the time the problem was solved, the vibrations turned my once quiet transmission in a very noisy one (i.e. vibrations rattled it apart), resulting in a $7K rebuild.
IOW, I would try keep driving to a minimum until you get a driveline vibration corrected.
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