I had the top off the transmission, that's how I put in the upper bearings and the "plastic bushing".  The serial no. is 88-241-873.   I don't know if it has pressure lubcation or not.   The one that I have had for 24 years and no transmission trouble is 78-286-873.   It had a transmission filter on it when I first got it.    No oil was going through the pipes so I took it off about 20 years ago.   I have not looked inside the tractor in about a year, I have had some health problems and problems with another tractor that I depend on more.    Thanks John