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Service 4wd light and difficult to engage 4hi

Sean1977
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Sean1977 New Member

Sean1977

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the "Service 4wd" is lit and I have trouble to engage 4hi for my 2000 Yukon XL 2500.  To engage, the trick is : in stationary, go reverse, neutral, and then select 4hi.  Similarly to go back to 2hi.  I don't seem to be able to switch to 4auto regardless.  Any idea of what is wrong?  Thanks!

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