Original 3 speed disassembly

[Jeffh]

I need help. '60 Apache. Original 3 speed trans leaking between main case and tail shaft piece. Bought a new gasket set. Removed the side cover that has the linkage levers, removed the four bolts on the tailshaft. Tailshaft comes back about 4 inches then a large gear that wont go through the hole stops it. Any ideas? I was thinking maybe the tailshaft itself would stay with the trans and the outer casing would come off but apparently not. By peeking in the side cover looks like one gear has a chip on the edge too...