Reasons for Vibration/Hum in Front End

[mu2bdriver]

Continued thanks to those members who have helped me in the past and thanks in advance to a great group who can help me with a new issue that's surfaced within the last ~5000 miles...

I recently had new tires put on my stock 2000 Explorer. Previously the truck pulled to the side and was pretty out of alignment. Now the truck points like an arrow but I'm starting to get a hum on the front end at almost all speeds. At highway speeds in excess of 60mph it's loud enough to not be able to hold a conversation at normal levels. The truck has ~145k miles on it with fairly new front brakes. Any ideas? Wheel bearings, bad alignment, etc?

The tires don't have an aggressive tread and are inflated to spec,
It only started after the new tires and alignment and has been getting progressively louder at all speeds,
It hasn't seen any off-roading past a country dirt road,
Everything in the front end, less tires, shocks, and brakes, are original.

Thanks again in advance.

 

[shadowless127]

sounds like bad bearings.

One way to test is to put the truck on 4 jack stands, put the truck in gear and see if you hear the same noise. If you don't hear a noise, then it's tire noise. If you do hear a noise, it's your bearings.