So i replaced the center bearing and the donut bush and reinstalled the prop shaft 4 weeks back. First few days were fine but the vibration is back between 15km - 160km - seems to level off when near 180km/hr to 200km/hr on the autobahn. Following installation of these new parts, is it a necessity to have the prop shaft re-balanced prior to refitting? I'm just stumped as to what is going on now. Could the vibration be a worn flywheel (206,000 km on the original one at 29 years of age) or signs of a worn clutch kit?