you will have to be pulling the trans top. i know on a 9n/2n that is a pita.
you will need to get it pried back out of the 2 gears it's in.
many times the shifter pattern gets worn and so dies the nub ..
i reccomend getting hte rears off the ground so you have jiggle room, and in the end, I bet you will be turning the engine backwards a hair to help unbind it from the front.