My truck has developed a faint chirping noise that speeds up and slows down based on wheel rotation speed.

I checked the calipers, shims, and pads last weekend but could find nothing wrong

I rotated the front hubs with calipers removed and could feel it was a bit less than consistent as far as drag goes.

I'm wondering of the front hub bearings are worn and approaching failure. Truck has 142,000 miles.

Anyone know of any history on this symptom, and a solution or it?

Hub replacement is fairly difficult and costly from what I have heard.