My 55 TBird has it's original T86 R10 three speed top load O/D transmission.  It has leaked fluid since I have had it.  I think it is leaking from the front, but it doesn't put oil on the clutch or pressure plate.  When I rebuilt my engine last year, I removed the transmission and pulled the front bearing cover.   There is no front seal in these transmissions.  I called Vanpelt and he confirmed there is no front seal.  These transmission use rifling groves on the input shaft to retain the oil.  I put a new gasket on the input shaft cover, new seals on the shift levers and the O/D solenoid and reinstalled it.  The transmission works perfectly, but it still leaks on my garage floor.  I use SAE 90 Ford Tractor Mineral Oil in this transmission.  Any ideas?