My truck has been making a strange humming noise from what seems like the front end for months. Everything in the front end was checked, bearings, bushings, tie rods, etc.....EVERYTHING. I'm stumped here, it does it most of the time but sometimes will go away, sometimes it goes away when I let off the gas, sometimes it doesn't, but it is there 80% of the time.Most noticeable at lower speeds but when i get going not as noticeable, prob because i forget about it....wish I could provide more info, my last stitch effort thought on this was rusted and/or warped rotors, but they're fine and the pads are too. Help.

 

i had a humming noise coming out the back of my truck last summer and it turned out being the gears in my differential not quite lining up right. since you have a 4x4, it could be something like that in the front end.