humming noise when I shift from park to reverse

2003 MERCURY MOUNTAINEER
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BOSTONSCOTT
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humming noise when I shift from park to reverse or to drive in a 2003 mountaineer also when the truck is in park and just idling makes the noise. not constantly will make the noise stop and then start again.

Just bought this truck. makes a humming noise when I shift from park to drive also makes it while driving. car can be in park still running and its makes the noise not constantly but every once in a while
Apr 9, 2012 at 1:49 PM
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