i know this has prob been talked about before but i am gonna share my experience. i found this link http://www.explorerforum.com/forums/....php?p=1842723
and followed the guys instructions because i could not get it to go into 4 wheel drive, well after getting the truck to actually "click" into 4x4 my hubs would click and get stuck locked if they did lock. so yesterday i pulled them apart like the guy in that link said only i used a parts washer and brake clean to clean them, they were filled with grease, and applied a small amount of grease and now they work perfectly. if that guy is on here, thanks you are the man