Ah yes... My GSX used to leak oil EVERYWHERE! Turbo return, oil pan, front cover, valve cover, filler cap, etc.
Rebuilt it, and now it only seems to be a slow leak at the valve cover (have the spare, just too lazy...) and at the rear seal oddly enough, and I think I'm blowing some through my turbo...
Just figured I'll fix it all when I start doing my summer upgrade.

But to the point, let me know where you're getting your tranny from/rebuilt and ask if they sell the Evo 5th gears. I've been trying to track a set of those down for a while now. 2 birds, one stone type of thing.

I'm interested to hear what the issue is. Good luck.