I am having a problem feeling a vibration in the truck when turning at low speeds from a stop. Its feels almost like the 4 wheel drive is engaged but the wheels dont feel like theyre grabbing like they do when the 4 wheel drive is engaged if that makes sense. Once the truck is moving straight there is no vibration and it also gets worse as the driving time increases.

 

First make sure the hubs are not locked in manually, but it sounds like a wheel hub is going out on you. Jack the truck up and spin each wheel to see if you feel it grinding, push and pull on it too to see if you feel any movement that shouldn't be there