OP, did you read your owners manual? It explains 4x4 operation in there.
People are retards when it comes to 4x4's. My brother asks me to check his explorer after his mechanic said he had a trans issue. Of course the fool was driving in 4Lo. I show him how to engage/disengage 4Lo and he says thats a lot of shit to go through
So I tell him to stay out of 4Lo. His truck probally had trans issues because he drove like that for a week....retards.