F150, 2012, 4WD, 5.0L,xlt.

only 70k miles and there is a humming sound from the wheels but there is no play on the wheel

 

it can be a real pain. Try the easy stuff first, are you sure it's the front if so swap tires front to rear and see if it moves.

 

It could be a few different things, not necessarily a bearing. Does it vary with road speed? How about turning left or right? Acceleration or braking?

 

Bad bearings on the front would be easy, there is normally slop, rear is tougher but drive it and then see if one side feels hotter than the other which also works on the front. I would do what JC said first and move tires around and see if the noise moves with it. Also check front and rear difs and make sure they are full.

 

i had to replace bad bearings on my old truck (09 ram). Jack up your truck. and spin the front wheels by hand. if you hear a bit of clicking they are on their way out. go ahead and do them before they give you some play. I didnt feel any play in mine at the time. left them on and they were gone rather quickly. Amazon replacement from MOOG worked great and much less than same day at auto part store.

for the rears, you will hear the rrrrrr growl. if the loudness changes as you accerate and decelerate, it is more than likely a pinion bearing or carrier. if it just growls, then it is a wheel most likely.

 

Get your self a stethoscope and start at the rear pinion bearings

I had a inner bearing pinion bearing go in my truck and was able to put the truck on hoist and put it In gear and was able to pinpoint the bad bearing it’s a coat hanger on the end so I didn’t have to go under the truck