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from the original direction of this thread, OP is looking at a lot more than a trimatic can handle. 400HP is about their limit (or so i have been told) before the housing poops itself.
powerglide can easily go to 1000HP and i have a seen a few running 1500hp
and god they are nice to drive
you would be suprised with the trimatic.my father in law owns his own shop and specilises in transmissions.and the trimatics ive seen that have been built and put through racing/burnout comps and still 10 years later going strong you wouldnt beleive it.yes the t350/400 range and glides are good but add alot of extra weight aswell.........depends how serious you realy want to get