I have been using 904 transmissions for about 25 years and haven't had any major issues till recently.So with the added power that my cars been making I lost the sprag last year.Then we took the guts out of it and reinstalled in another case but now it slips going into third.So I figured it maybe time to put some good parts into it.
So the main questions is how do I modify the main pump support for more flow to high gear?
