fan clutch noise? mine does this as well, under load when i lift off the throttle i can hear it as well. i had the sound diagnosed as a fan clutch but havnt fixed it yet.
i have a turbo noise issue as well (see post) the above picture helps with my description........ i am hoping a turbo issue isnt hard to fix?

 

My 2010 King Ranch makes the same noise when I shut the engine off. This truck only has 9500 miles on it I noticed it 3 weeks ago after driving through heavy snow storm. It does sound like its coming from the fan clutch.