I have an 83 T5 tranny from a camaro/firebird-v8, It was leaking slowly "about a quart every two weeks" from the input shaft where it meats the bellhousing. Pulled the tranny replaced the bearing on the input shaft - a shop charged me 40 bucks to pull and press new one on to input shaft.
Also replaced the seal there. Put in the roller bearing shaft thingys "sorry" with assembly lube followed this article http://www.zbag.com/T-5_Service_Manual_1.pdf

Put tranny back in filled it with 2.6 quarts of dexron II, Thousht we were done....

Next day notice still leaking... Pull tranny again next weekend, Not leaking from the input shaft at all! Its leaking from the circular freeze plug located underneath the input shaft (See Pic)

cleand then RTV'ed the crap out of that seal let it sit for two days then bench tested with a quart of fluid and tipped it slightly - no leak

put it back in drove around a while. STILL LEAKING!

We have become a pro at pulling out and installing this thing, but I am FED UP!

Any of you T5 Gurus who might have any ideas let me know. Thanks!
We are pulling this tranny one more time tomorrow night to see whats up,

Sorry for the novel sized post Thanks,