locking hub hot to the touch?

[1969 GMC]

well guys, i thought i needed new wheel bearings, but today i drove my truck to work fine and none of the howling noise i have been hearing alot lately. anyway, the last few days whenever i wanna lock the hubs into 4x, the passenger side wont turn by hand, even if i move the truck forward or backward a lil bit. i usually have to end up putting a set of channel locks on it and using those, then it goes easy. tonight on the way home from work, i had to use the pliers, and when turned almost full lock and moving, the truck would make a funny noise. then when i got home, the passenger side locking hub is warm to the touch (not hot, but warm), and the driver side is cold as usual. do i have a bad axle ujoint on the pass side? what else? thanks in advance.