i'd also agree with closer ratio's or diff ratio with a GZE..

i had a 4.3 diff ratio in my AE86.. ok for NA.. and with the GZE!! well... have a look at the 60ft acceleration in this video.. soooooo much better than the 3.7 i replaced it with for a while till i could find another decent ratio..

http://www.youtube.com/watch?v=i9Z3B8_lYTs