2011 Silverado loud pulsating humming while driving
 

Good morning,
I have a 2011 Chevy Silverado four-wheel drive 5.3 flex fuel. 126,000 MI. Have this loud humming almost pulsating humming coming from the front end. It's very loud at slower speeds. It sounds like tire noise or etc. Just had a bunch of work done to it this noise was there before the work was done. Also Replaced both front hub assembly Replace the differential fluid in front and back. Transmission level is good and looks very clean. My mechanic has replaced oil cooler lines motor mount oil pressure sensor inner and outer tie rods and ball joints just recently. New tires not even 500 miles on them. I also put in new power stop brakes with the slotted rotors. They said that CV axles look good no visual cracks seem to turn just fine no clicking no popping. Took it to the differential guy who put some ears on it he also could not find any issue. Any ideas would be helpful I'm tired of throwing money at it