so when i got my 90 integra it came with a ys1 tranny out of a 92-93 integra, and because of my high rpm's while cruzing in 5th gear in the highway it came to my mind that it might be a first gen gsr cable tranny. so i wanted to make shure and take apart the tranny and count the gears to figure out what it is! so my question is does anyone know how to come up with the gear ratio i know that u have to count the gear and divide it by something. thanks in advance

 

what rpms are you at in 5th a 60mph?

 

Countershaft and mainshaft 5th gears should have 28 and 32 teeth respectively. You divide the countershaft gear teeth by the mainshaft gear teeth to attain the gear ratio.

RPM in 5th @ 60 mph should be 3300 rpm on 23.5" tires, 3550 rpm with 22" tires.