the hubs just started clicking everytime the wheels turn whether locked or auto, 2wd or 4wd. No rocks in the hub caps. Where should I start looking for problems?

 

You will here clicking if the hubs are locked in but in 2 wheel drive. If in auto and it still does it in 2 wheel drive sounds like the hubs are stuck in the lock position. Sounds like a trip to the dealer is in order. To check if the hubs are free/auto while the truck is in park you should be able to reach in on the driver side wheel well and spin the front drive shaft freely if you can not spin the front drive shaft your hubs are stuck in the lock position.

 

Same here. Interested in your findings.