So I'm in the middle of replacing my LBJ on my 99 4runner and I've got the 4 bolts torqued and the OTR torqued but my issue is with the actuall ball joint castle nut. It's not fully screwed in but it starts spinning.
Use the floor jack and lift from under the lower A arm. That will press the stud into the hole and you should be able to torque it then. Be sure to loctite the 4 bolts as well.