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My tremec is not legal for the fast class so i am changing it for a m22. Just trying to figure out what one to use with around 500 to 550hp at the tires.
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I would just use the Supercase and build from there. Or you could even find an iron T-10 case and build a pretty stout T10. The class allows use of different transmissions as long as they were made for a GM vehicle. One nice thing about the FAST class of racing is that the lack of traction definitely saves parts. Ed Cook's kid James grenaded the Hemi crash box I built for his RR, but that was attributed to driveshaft yoke failure. It's not likely that you would have any durability issues as long as you run the bias ply tire. Even less of a chance of trans failure with a "soft-lock" type clutdh that you would be wise to run.
Give me some details on the FAST build.
MB