Mike- i replaced my stock input shaft with a HI-FLow VASCO input shaft i purchased from Trans speacialties..12 5/8...its good for up to 1300 hp..
it cost me like $285......
i am surprised it didn't break !!..i just wonder is it damaged the converter..it cannot be good for it no matter what..
later Brian
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Bjuice..
"I'M YOUR HUCKLEBERRY ! "