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I have a 2010 F-150 Lariat and my 4wd isn't working. When i put it into 4wd it says its in and no dash lights are on but when I step on gas it grinds and when i turn it makes a cracking noise... It will still go forward but only the back two wheels are spinning... Help??
Look into the IWE's. They may be stripped or damaged. That's where my money is.
I thought of that also, but since he said he's not getting dash lights I figured the shift motor wasn't kick over enough to trip the internal switches.
Here was my take-away; "when I put it into 4wd it says it's in"
From that I thought, he was getting the 4H (or 4L) indicator.
"no dash light are on"
From that I was thinking no trouble lights like "engine" or "wrench".
I could be entirely off in my thinking, it's happened before but this was my best stab at interpreting the question.
I agree with this to, and bet IWE to. On my 06 I went through it, needed 4wd didnt work.....thought ok unhook the valve and Ill be on my way....nope, what I found was the IWE actually stuck in the unlocked position and wouldnt engage......no noises, grinding anything. The OP is getting sounds so doubt a stuck one is the problem, but Id start in the front. In my experience if its a T-case problem the 4x4 light will flash and you should be able to hear the case shift....really hear it go into 4lo.