I used USC in the 5sp with plain old redline 75w-90 in the rear end.
Worked like a charm. I could get the tranny to go into first gear from 30 mph without much force.
however...i no longer have that first gear. but that's probably from launching 200 times...
Now that I've got the 6sp I'm going to go 100% OEM until I learn more about what can go in the limited slip.