is there that much of difference...i can add the final usdm final drive in my car for about 700.00 installed or i could just get the spoon tranny installed for about 1400.00 including that i trade in my gsr tranny now...now i know the spoon is all around better, but i just concerned with the final drive ratio...is there that much of a difference between the 4.875 and the 4.785

 

adam,
usdm is 4.4 final
jdm itr is 4.785
spoon tranny is 4.785

big difference in gearing. go with the spoon.
if you do 4.785 in your gsr tranny, it'll be the same as a ITR w/ 4.4