mine turned out to the be O-Ring on the speed sensor. got it all fixed up and the car's good as new now.

 

Just updating this thread --- it was indeed the seal between the T-case and the tranny. Pulled the T-case, identified the worn seal, sent it off the Shep, re-installed stage 2 built T-case, and no more leaks. Rockin. Even re-torqued my headstuds while the build was underway.

Good to go!

 

your best bet is to take it to a shop and they will find it for you with a oil dye that they can see where is leaks from