I have a 1989 535i with a automatic transmission. I just changed the center bearing because i was getting a sort of vibration or banging in the middle drivetrain area when taking off hard and when it shifts through the gears if I give her. When taking off slowly it's o.k. So i was wondering if there is suppose to be a flex disk on this particular model or not. Changing the center bearing did not help. Can anyone help me this problem. Thanks.