I've decided i'm going to make the switch in my valiant from 727 to 904 in hopes of picking up the .15-.2 everyone says a 904 will net you.

So anyhow, i gathered up some local 904s and need some advice on what's the best plan of attack as far as parts to use and upgrades needed to survive my low 10 second 3000# car running a transbrake.

I've got a 73 and a 74 904, and an 86 999 transmission. I'd really like to be able to use the 5 clutch high gear drum from the 999, but am planning on holding off on using the low gear set. I'd like to see the back to back difference of standard gear 904 vs 727. Maybe later the low gear set will sneak it's way into the transmission.

What is the best case to build this transmission from? What changes are needed to run the 999 drum? Necessary modifications to the transmission to make it live? And finally, what's a good rebuild kit to use for it? thanks for listening! Andy