whoops, i wrote everything i wanted to say in the title.
I know you can do it with the different CRX trannies.
So you would want to put a lower 5th in your LS tranny? How come? Lots of people but a LS 5th in a vtec tranny. Never heard of anyone doing the opposite. Or am I super confused?
Leif
no no sir. The final drive isn’t the 5th gear. i understand its a “gear” that every gear goes through in the differential before transmitting the power to the pavement. Changing to a lower (or higher one -not sure which way) one will drop the effective gear ratio of every gear. Doesn’t solve the issue of the ls tranny having widely spaced gears, but it would shorten them all. If this swap works at all??
d
Then in that case I am confused and cannot help, sorry :sad:
Leif
how stuff works…
terrific website, this one’s about trannies in particular but they’ve got all kinds of cool stuff there. good place to go to learn about WHY your tranny does what it does, and HOW it does what it does.
http://www.howstuffworks.com/transmission.htm
and if you want to print it out, go here:
http://www.howstuffworks.com/transmission.htm/printable
enjoy. 
thanks zoomer