[grumpyoldman]

Thank you Ironman and Sam Mac. I found the drain plug. So that silver plastic reservoir looking thing is an expansion tank. Makes sense.

I just spent about 1.5 hours taking off the rear tires and looking at linkage and springs on the trans. I didn't see a fill plug, but I really wasn't looking for one today. As far as I can tell everything looks okay there. Then I tried to see what would be involved in removing the rear fenders/body and fuel tank. I learned you'd pretty much have to disassemble the entire tractor to go that route. Dropping the trans out the bottom would be easier (but not exactly easy). To try changing the fluid and adding the Lucas additive would be a fair amount of work with no guaranties and the cost of the synthetic oil and additive could run around $35-$40. probably not worth the time or money w/out rebuilding the trans. I just hate throwing a way a machine that could be fixed, but sometimes it's time to say goodbye.

A couple of years ago I pulled the engine and transmission out of my 2002/200,000 mile pickup truck and totally rebuilt them both at a cost of around $4,000 in parts and machining. At least with the prices on used trucks, thanks to inflation and lack of supply, that work turned out to be a good investment IMO. In the 7 years I've owned that truck I think I've fixed/replaced every mechanical part and system, but I bought it for almost nothing as a non-runner.