Hi all.. new to the site.
background
I have a 14 f150 5 litre screw.had since new. Tow travel trailer and only put 6000 kms on it while towing 6500 pound. Currently there is 85000 kms on it.
So recently there is a noise that I noticed. At 1st it was random while driving I would hear a whine sound but deeper when I drive at low speeds. Only for abiut 20 seconds.
Now it seems to be in the morning when I 1st pull out of the drive but goes away in 30 second or so.
not much to go on but it's something.

 

You might want to change the rear diff fluid.

 

I would get a Ford dealer to listen to it. Hopefully you can get it to make that sound when the tech is in the truck.

You have a 5 year/100,000 KM powertrain warranty.