Ok, after some fiddling around and study of the auto hubs, they must have gone bad somehow. Although, I can see no outward sign of damage. So, I tell my wife we can have new manual hubs for 85 bucks. She's not freaking out since we don't use the 4wd in the summer anyway. Then I get to thinking......I say, "You know that manual hubs means you have to get out of the truck to put it in 4wd, right?"
"WHAAAAT?!?!?, CAN'T YOU FIX THE ONE'S WE HAVE?!?!"

So, can I get new auto-locking hubs? Someone must make after market auto-hubs. Will they be more expensive than their weight in gold?