yes, there was 2 psi cases, one for the ball diff, and one for the gear diff which is even harder to find. I run the ball diff but since I run a 13.5 on carpet (with alot of turbo/boost) I just leave the diff alone, sure, it may possibly be the crunchy, nastyest diff you will ever feel, I don't want to bother messing with it often. I have a freashly rebuilt and broken in diff in my rear motor car that I could swap over with ease but it would just get shredded any ways. I tried to get a gear diff tranny case then the day I was going to pay for alot of PSI parts I was told the company was sold
