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2005 F-150 4 x 4 w/5.4L. High pitched (whirring) noise. Seems to be coming from above the engine just in front of the firewall. Started intermittently at less than 12K miles. First noticed during very cold weather. The sound stopped after a couple of minutes of operation. Vehicle now has 80K miles and the sound is present at higher outside temps and continues. The frequency seems to increase with engine speed. When transmission up-shifts the frequency decreases. Don't know if it is a vacuum, intake, or transmission issue. Performance is not adversely affected.  

Possible torque converter problem, do a filter and fluid change.  

Hello i was just wondering if you found the problem to your truck! I have the exact same thing happening to me word for word. Please reply thank you  

THAT IS THE TORQUE CONVERTER AND I KNOW EXACTLY WHAT YOU MEAN ITS LIKE A REAL FAST PUMPING SOUND MY 79 CHEVROLET HAD A BAD TORQUE CONVERTER AND IT MADE THE SAME SOUND WHEN U TURNED THE KEY OFF IT WOULD MAKE A GRINDING SOUND DOES IT MAKE NOISE WHEN YOU GO INTO GEAR TO AND GET QUIET IN PARK AND NEUTRAL THATS WHAT MINE DID ANYWAYS I KNOW FOR SURE ITS THE TORQUE CONVERTER REPLACE IT AND THE NOISE WILL GO AWAY A PUMPING SOUND WHEN ITS COLD IS NORMAL TILL THE ENGINE WARMS UP THEN IT SHOULD GO AWAY U MAY TRY LUCAS TRANSMISSION FIX FIRST I DONT KNOW FOR A FACT IT WOULD FIX IT BUT WORTH A SHOT 12 DOLLARS VERSES 100 OR MORE FOR A TORQUE CONVERTER ULL PROBABLY NEED 2 BOTTLES I USE 2 EVERYTIME I CHANGE MY FLUID AND FILTER HOPE THIS HELPED