Question about 2005 Ford F-150

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06 front locking hub makes noise only in 2hi, checked vacume but didnt solve the problem.

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This is a very common problem. You must have a leaking IWE and you have to check it at each individual wheel. WIth a vacuum pump and gauge, test each side individually. If either side (or both) cannot hold about 5inhg for even 10 seconds that's likely your culprit wheel. You should be able to pump up 5inhg and turn your 4x4 shaft.

http://www.f150forum.com/showthread.php?p=210744

Posted on Jul 13, 2009

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Or try to duplicate the problem by putting it into 4-high. THAT way the dealership would know exactly what to look at.

BEST REGARDS
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