20+ years of "Building 904/727 for drag racing use"

There can be. I'd say up to 500hp naturally aspirated with a lighter car you'd be fine. I've built several.

However, the weak link will be the factory input shaft/forward drum. The input shaft can rip out of the drum.

There is not an upgraded input shaft/hub assembly for the A500, 42/44RH&RE transmissions available at this time.

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What about for a 904? I take it there are stronger shaft/hub assemblies avaliable?