Just got truck couple days ago, and tried the 4x4 out on wet levee ramp and the 4x4 isn't working. I called up dealer my aunt got truck from and they said to send it to local ford to see what problem is. Local ford said the axle isnt engaging the hubs and there is slack in the wheel. So now my truck has a 7 day date with dealership it came from. I've heard of vacuume problems, but what are they talking about with the axle?

 

Might look

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And

Here

 

And here: https://www.f150online.com/forums/20...ore-snows.html