THANKS CARL T. FOR RESPONDING.NO VIBRATION IN ANY FORWARD GEAR.I HAVE ONLY FELT THIS TWICE.ONCE WAS ON LEVEL GROUND BACKING UP.THE SECOND TIME THE CAR WAS PARKED ON A DECLINE AND IHAD TO BACK UP TO AVOID A POT HOLE. I HAVE AFULL WARRANTY ON THE CAR AND THOUGHT SOME OTHER 850 OWNER MIGHT HAVE EXPERIENCED THIS. JUST LOOKING FOR SOME POSSIBLE ANWSERS BEFOR I TAKE IT TO THE DEALER.THANKS JOHN THOMPSON