This may or may not help, but if you have a locker( i.e. Detroit EZ Locker, Lock-Rite) in the rear, it will do this. There is a little "slack" in the rear end once they are installed. Noticeable with an auto, no so much with a manual. I have a Lock-Rite in my '97 Sport, and it does exactly the same thing. The locker manual says this is normal.