Ryan, A good used 901 can be anywhere from $500-$1500. Rebuilds cost about $950+$1500 for LSD set at 40% lock-up for street. A 915 tranny is stronger than a 901 in stock form. I'm using a 915 in my project, install is about the same as 901 in a bug set-up. Check this site out www.rennsportsystems.com  , and this site too www.motormeister.com
This should help understand more about the gearing and case changes over the years.
Later,
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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
Last edited by wrenchnride247; April 25th 2006 at 21:59.
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