I am thinking somehow the c-clip came out, or might my problems be worse?
What else should I replace while I got the gearbox apart.
It takes some more effort than it should to put it in gear, and shifting from hi to lo requires a rubber mallet. It also will slip a little in 3rd when going up a hill.
I would like to fix it and anything else that I can so I can be done with it, so long as the cost is within my budget and not more than buying another yard tractor.