Earl,
I have a Tremec 3550 behind 600 HP BUT I would never drag race with it and I never make full power shifts. I will keep open trackin with it until it breaks and then it's a Jerico.
I think DR. Hal is correct about the TKO only having a bigger input and output shaft.
Cranky
Oh Yea, A few years ago Bob Bondurant said the Tremec was the best shifting trans he has ever driven.