I have a roaring noise coming from the right side of my truck. Can hear it going straight and gets worse turning to the left. My thoughts were the right hub and bearing assembly so I changed it as well as the right CV axle. Can't tell if its coming from the front or rear for sure now. I have also rotated the tires and it did not change anything. Anyone have any ideas on what it could be? Its a 07 f150 4x4

 

Define the roaring noise, a rumble/ grinding? or a howl? It may help us help you better if you can define that, and only when driving forward? and how often?

One thing to try, and it's worked for me so far, is to (while the noise is being heard and in motion) engage the 4WD to see if it may go away, if so, your IWE 4wd vac system is at fault.