I was wondering if I drained fluid and took the pto cover plate off I could use a screw driver to wiggle gears around and try un jamming it from the bottom end since the top cap cant come off u less you have it halfway in reverse.
PTO covers of, should be able to work 3rd speed counter gear rearward. Look for part of snap ring jammed between shaft & gear if won't move with moderate pressure. Correct on the mid way position of the reverse lever for cover removal.
Special tool for removal of main shaft & rear counter shaft bearings that goes into the snap ring groove in bearing race. May be a trans shop that would pull the brgs for you.
BTW, I've got 2 of the sleeves for the updated repair. If you want one send me a p.m..
BC