Idk about 4WD....i had my hubs out anyways when I was driving because I thought it was the hubs trying to engage. And I just now got everything down to the hub assy off. I'm going to try to get the rest off tomorrow.
Inside, where the locking hub goes into, there was what looked like silver grease and metal shavings....I guess from bearings are there bearings on the backside? I had a repair manual...but my wife decided to clean and now I can't find the darn thing.
this makes me think you have two problems.. because we still haven't discussed anything outside of the front end..