Said I was new to this, didn't I. Anyway, trying to figure out how to fill the transmission, with both Hydrostatic(?) fluid and transmission fluid. I have 80/90 fluid, but I'm not sure where to put it in. There is a rubber plug and an earlier thread mentioned filling at the 5" rubber hose. I'm certain someone has more answers than I have questions, and I am all ears. What fluid is used for the Hydrostatic side?