Hi Jordan
Observation if you run the engine on the test stand with the transmission in gear the output flange needs to be in place, or you will have puddle of gear lube on the floor. Yup I found this out first hand.
Edit--Found the picture.
I was surprised at how quickly it tried to basically pump the gear lube out of the transmission sort of explains why this rear seal is a source of leaks. My output shaft had a grove worn it to so it got a speedisleeve. Also the special washer and nut that hold the output flange in place got a little gasket cement.
Cheers Phil