There's a tiny snap ring above the bearing. There is a burr there. Shaft gets crusty too. To file, sand, otherwise rub away burrs and rust should let the shaft slide right through the bearing. If not you'll need use a puller to remove cast upper bell with bearing.
The box coupling rebuild kit does include new cross pin. Its extremely tight press fit to the shaft so you would need a press to change it and get it properly centered. If it was very worn its ends would be egg shaped enough to see, but minimal wear would require measuring tool to see.
I've replaced only two of these pins. One was done with a shop hammer over anvil. It can be done but its a real challenge/chore.
The shift tube has a plastic pin in it that operates the reverse lamp switch. Be careful how you move things or break that pin. If its OEM switch and pin, I would bet its on the verge of failure anyway. To take that switch apart, clean and lube can help. Good luck with it