Hi guys,

I'm having a rather difficult time trying to find specific information relating to the gearbox I have and what I want to do with it. Just wondering if anyone here might know?

I have a 94 CRX B16a2 engine with Y21 gearbox.
I want to play around with the ratios to get the revs down on the freeway, but I can't work out how many variants of these B series gearsets there are.

In the worst case, I don't know whats the same and whats different between AUS/NZ, USDM, JDM and EUR market gearboxes, and whether gearsets from b16 and b18 can be interchanged.

At the end of the day I want to change out my 5th gear ratio to a .714 or a .787 to adjust for a different final drive - is this possible in my gearbox?

I can get these from the US or the UK intended for a B18 - but I don't know if any are useful.

Any help on this would be a huge help to me.
Thanks.