A-999 Swap and Information

fishy68 said

I believe all you just have to do is swap in the 999 planetary gear sets, sun gear, and clutch carriers. They are what determines the gear ratios and torque carrying capacity. A real good upgrade to do at the same time is install a multi return spring set into the front clutch carrier in place of the factory single wound spring.

If I've missed anything someone please correct me.

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Actually, it's not that simple! Better to find an actual 999 but unfortunately they are as rare as hen's teeth. I looked for two years to find one.

You can put a low gear set into an earlier 904 but that's about it for later parts going into an earlier trans. The real beauty of the 999 is the 5 clutch drum but to install one in a regular 904 requires a lot of careful and hard-to-find parts matching.

Read here.