904 Steel Planetary Upgrade

I guess you can, but I have heard very little about problems with the aluminum planets in the 904. Certainly if you can afford it, go for it. Also one thing I saw that you omitted was that "I" would recommend running the flat out widest 2nd gear band that will fit. Also of course make it a ridgid band. JMO.
Yes for sure no flex bands hear. Cast rigid only! I got the trans for $50 so Ive got some cash to throw at it, I abuse my transmissions so I want it built to handle some rough stuff. Planning on building a pretty stout small block in the future too.