I have a 05 F150 5.4, 85000miles. The past week there has been a whining noise when accelerating. It sounds almost like a turbocharger sound. It only makes the sound when in a gear (not park or N). A buddy found that it was loudest under the truck near the flywheel. He believes that it is either the flywheel or the torque converter. Just wanting to know more opinions on the situation. Thanks

 

Maybe the tranny is on its way out? I'm just guessing no expert

 

MY expedition does the same thing, but when it does it it gains power like a supercharger and when it doesnt do it its slow! not sure if there suppose to do that but would like to know why?

 

i would suspect its internal gear train as the torque convertor still turns in park or neutral bearings or planetaires maybe

 

well i finally chnaged my flywheel after 3 years with 323XXXmiles on her but i havnt heard the noise no more, alot of the teeth were broke! but i wish i know what made her run faster before