My best guess would be to call www.wittrans.com and see if they have the parts. They sell used parts but only list the 904. I'm sure they have more than is listed on their website. Make sure and get every part associated with the planetary gearsets. Every washer, snap ring, the sun gear, and gearsets. Anything you see in that area on the parts diagram.
Yeah, the link rmchrgr posted really cleared things up. Thank you so much for the help. I wanna build a stout transmission to house my reverse manual valvebody Coyote Jack gave me and so it can handle some time at Road Atlanta
