i think the hub bearings in my wife's '99 GC I6 2X4 might be going bad. about 2 months ago i put new firestone tires on her jeep, and they had a little more road noise than her previous set. however, the noise has gotten progressively louder over the last several weeks. it sounds like a howl, like she's got a set of buckshot mudders. the noise gets progressively louder as the speed increases. does this sound like the hub bearings? is there a good way to test to see if it is the hub bearing? if so how difficult a fix is it? any other ideas as to what it might be?
1999 Grand Cherokee 4.0
Bone Stock other than K&N airfilter