For B5 VW Passat with automatic transmission – a cheap rebuilt joint on the driveaxle can result in driveline vibration when stopped in drive or reverse gear that goes away in neutral. This is why on the B5 Passat or Audi with auto trans, you don’t want a cheap rebuilt axle from your the local parts store. See http://www.myturbodiesel.com/1000q/b5/CV-boot-broken-replacement.htm for the repair procedure and how to replace the CV boot.