when u took the tranny out the second time did you check the pressure plate bolts? Cuz I had a Tripple Plate in my AE86 and I had a problem going into reverse with the gears gringing and shifting to 3rd and 4th when i had it in Neutral cruzin. and it had a weird rattle when i was redlining 9G's. Turns out I broke 10 of the 13 bolts holdin the pressure plate to the flywheel.
Plus a lot of after market clutches require special TOB's like the OS Giken
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