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I have a 2008 Cayenne with 65K miles that had a major vibration during acceleration. Turns out the drive shaft bearing was toast. Bearings alone were not available from Porsche. Had to buy a whole new drive shaft. $1,200 repair. Runs great now and hesitation that I had during acceleration and vibration are gone. Is this a common problem? Why isn't a replacement bearing available? Will a VW Tourag bearing fit the Cayenne?