ok ..had the car in the garage today,lot of vibrations going under the car....suspect propshaft center bearing...exsposed the propshaft after a good days work droping the exshaust..found the bearing and the propshaft to be ok,much to my disapointment.in saying that i can move the shaft up and down in the rubber mouting. sould i be able to do that,,i dont know how tuf that rubber sould be....... the car is a 1990 bmw 750i...... checked the sevice history and the prop and bearing was replaced in 2000 at 104000 miles ,now done 130000 miles .also the gear box mountings in good condition .........RALPHIE