Hello, while driving our truck has been making a loud squealing or scraping noise while driving, the second I lift off the gas pedal the noise will go away. But then press the gas peddle again and the noise will not come back. This noise will come and go, it is really loud to the point it actually sounds like something metal is dragging under the truck. I have taken it to Ford for service but they just keep telling me that can hear the noise that I do.
Any help would be great. Thank you

 

Try to record it with your phone