I don't know about that. I just had my 904 rebuilt with a transgo shift kit, low gearset, and a factory high stall converter, and left in my 2.76 rear gears. My car woke up like u wouldn't believe. Much quickening the line, breaks loose my org leg so much easier, even with heavy 22" rims and and a highway rear gear. It could be a combination of everything though.
