Farmall Cub

I new here want to say hi to everyone. I got a question about my 1954 farmall cub, shifting fork for 1st and reverse broke. I know I have to split it apart to replace it was just wondering when I split it apart will the drive shaft come of the transmission or will it come out of the clutch plate? And if it is the clutch how hard is it to get it back in Thank you

The tractor does not have to be split to replace the fork.

Want to thank everyone on the information to my problem.