Saturday I noticed that my left front tire was making a low squeak squeak squeak sound when driving at lower speeds. Sound appeared to get louder when I turned the wheel to the right. Only way I can hear it is driving through the neighborhood, not on an open is it happening at a higher speed, I dont know. Engaged the 4WD and the sound did not change. Truck is a 2006 2500HD Silverado.

Any idea what the problem may be?