1972 C10 2wd M20 wont go into gear

[ratman90]

Hello. Working on maintaining a 72 c10 we pulled from a field last summer. All has been good. Redid brakes, lines and all. Now the truck will not go into gear. Seems to be stuck in neutral. With or without clutch it will not go into gear. Pulled shifter up and out and it seem,s to be fine.

Has lube/oil/grease on it and does not seem to be broken. Can place back into top of tranny without a problem.

Have not pulled inspection cover as we have to pull that crossmember it seems. Which means grind down all of those rivets.

Any hints, tips tricks to try before we do all of that? Side of tranny is so covered in oil,grease and dirt it will take a week to get to the bolts.

help?
Larry