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IMO, 915. By the time you "rework" the 901 (not cheap) a stock 915 will handle it. I have asked questions to several Porsche gearbox rebuilders, and have gotten quite a shock on different rebuild prices. (ONE gear stack is about $850) Matt, at Carquip, in Colorado, has been very helpful. He said the 8:31 is way stronger than the 7:31 in early 915's and 901's. The 915 tranny is a little longer, but with bug@5speed nose cone it's alot easier to fit in a T1.
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1970 T1 W/MassIVe 2913cc RAT/?EFI? w/direct fire (very soon) and 915 trans 
1962 SC 1776cc SP 944NA brakes, 993 wheels
VKG
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