Thanks for the ideas. I had studied the SM and the Parts Manual so I knew what was in there. Definitely not engine oil as it was clear. And working the PS and Hydraulic with tractor running but not moving did not cause leakage. But moving the tractor with no hydraulic or PTO use did cause leaking, but it stopped quickly when I parked the tractor, with engine running.
So I am leaning towards the drive shaft input to transmission. Was too hot to really check, and I have been tied up today so haven"t been able to pull the two covers.
Yes, I know all about the 2010 bashers. Tractor with a super bad rep, but this is a late "64 model and has been really reliable, except for some starter issues (Parts N/A for the Prestolite used on the Diesel model).
Dug out the Power-Trol I bought for our old "44 A and guess I will pull the power lift and install this. I have run the NH 477 with it numerous times before, and it should handle the little Hesston 5530 OK.