It may be a problem with your clutch fan being faulty. I've heard some guys complain about the same problem. Just a thought. I notice a slite "woom" type sound once in a while after shut down. I figured since it doesn't do it all of the time it really isn't a problem. Take it into the dealership to have it looked at bud. 
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2008 F-250 Lariat Crew Cab, 6.4 diesel, moonroof, reverse sensor, tow command power mirrors, snow plow prep!
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