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At 500hp I would just bite the bullet and go R154 or V160/1 if you could. T56 would be an option but no one makes bell housing to use them on a toyota JZ block.
well so far i exploded 1 trans. it had 210k on it break boosting in second.
second trans was just making really loud noises and i sent it back and they sent me another one for free that looks almost brand new.