Why is the ford f150 making a humming noise while driving?

There are a few reasons why Your Ford F-150 might be making a humming noise. The most common cause is a bad wheel bearing. In addition to the humming sound, You might notice vibrations in the steering wheel, tires wearing unevenly, or the car pulling to one side randomly. Replacing one will generally run You $230 to $260, with labor accounting for $80 to $100 of that total. The next most common cause of whining in this vehicle is a bad alternator. This noise, which is most often called alternator whine, happens when the voltage level drops. It's most often present while accelerating. Replacing an alternator in this vehicle is around $450 to $490, including labor. Lastly, the transfer case could have worn interior components or might be low on fluid. Check the fluid level and try shifting slowly through all the gears while driving to see if the noise is present more in one particular gear.