I was experiencing loud clanking and bumping when shifting from R to D and visa versa. I diagnosed the problem to the front flex disk and I just got finished replacing it. The clanking sound is gone, but the bump still remains when driving and letting off the pedal and when shifting. The back flex disc appears to be fine, but I am not positive. Also, I think I remember reading something about a part in the middle of the driveshaft. Could that be my problem? If so, what is it called and how do I go about installing it?