Could be your hub bearing. Had mine go out a few years back. Take your tire off and take a look at the bearing. There is a rubber gasket that keeps the races clean, and mine was toast when it started making noises. Our Jeeps do not have serviceable bearings, so if yours is making that noise, you'll need to replace the whole hub. If that's the case, I would start soaking your hub bolts (three bolts on the back side of your knuckle) with PB Blaster now. If I remember right, mine was about $80 at autozone.
IIRC, all you do to replace it is jack up the jeep, remove the tire, remove the brake caliper, remove the rotor, loosen the axle nut, then remove the three bolts holding the hub to the knuckle. Those take a 12 point 13 mm I think. After those are out, you can take a 1 and 1/2 inch socket extension and use that to help remove the hub. Luckily for me, my hub came off without much fuss, but if you're in the rust belt, I wish you luck!
Hope that helps!
Originally Posted by mdm
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