
I'm the fan of doing it the easy way.
Undo the input shaft nut.
Remove the selector detent ball and spring.
Undo all the back cover screws.
Prop the transmission, cover down on parallels.
Lift the main case off (note any shims)
The result looks like this image
Do repairs as necessary.
Stack the repaired parts on the back cover.
Drop the case over the assembled works.
Reinstall cover screws.
Reinstall input shaft nut (torque properly).
Done.