"this has nothing to do with heat or rear clutch apply leakage , that is how the sprag operates , it's NORMAL."- Yes, we both agree. That is what I was trying to say, sprag seems not to be an issue

If you had rear clutch apply leakage you be having slipping issues in ALL forward gears.-ok. Hmmm. There is no slipping at all that I can discern other than what I noted.