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Is the diff and transfer case fluid clean? Dirty fluid will cause this problem.
 

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what is happening thats causing you to think 4hi is not engaging?
 

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yeah 4hi there shouldn't be any "4hi" lights. only thing that should happen is the front wheels will light up on the indicator next to the mileage. i think if the 4hi light lights up its telling you theres a problem lol
 
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