my f-150 sounds like im running knobby tires on the front end and gets louder with speed.unfortunatly im running a light all terrain tire. ive checked the vacuum motor on the front diff to see if it was stuck in the lock positon, but it was moving good. the noise is with a vib that i can feel in the steering wheel and the gas pedal/floor. the noise/vib quits only while in a right turn, any other direction/speed it continues.
if anyone has a clue it would be greatly appreciated.

 

inspect u/cv joints fore and aft.