Hello all, I have been reading these forums periodically since first getting a new F150 back in 2010. I have learned much, but never felt the need to register and post anything. Anyways, I currently have a 2014 supercrew XLT 4X4 with the ecoboost. Right now I have 32000 miles. I haven't had any problems with it and love it. One thing I have noticed for at least the past 2 years; sometimes on the highway I need to go and get to speed fast. It's nice to know that power is there when I need it. Let's say I'm going 50 and need to get to 75 fast, so I swiftly press the accelerator to the floor. I will hear a loud squeal that I can only describe as the same pitch as a slipping belt. If I apply the pedal steady, this doesn't occur, only when pressed quickly. Has anybody had this happen? I plan on taking it in to check under warranty, but haven't read of anything similar and wanted it out there in case anyone else has this issue.

 

It probably is a squealing belt.

 

does the squeal coincide with the downshift?

Its fairly "typical" that you get a belt squeal on a WOT downshift. A new belt could help.

 

Yes, it does coincide with a downshift. Sounds reasonable to me. Thanks.