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Old January 28th, 2012, 01:55 PM   #9
grose
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A little further diagnostc info. Will not engage when going over 10MPH. I hitht e swthch, hear the transfer case engage and then a grinding noise starts.
Under 10MPH in neutral or reverse, 4 wheel engages just fine with no issues.

No light's blinking no 4x4 code thrown.

This leads me to believe that there just might be a small vacuum leak somewhere. It might not have the power to engage the coupler at higher speeds, but lower speeds it can slide over.

What do you guys think?
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