rotate your tires, see if it goes away.
while the tires are coming off, you can test the whole front end out for play.
jack the front wheel up, lug nuts tight still, then push and pull the top of the tire, if it moves, the hub is bad.
then take the wheel and push one side and then push back with the other, (left and right side) if it moves, or clicks, the tie rods are bad.
then take the wheels off, look at the lca's bushing, the sway bar bushing, and end links and look for a torn boot on the axle.
axle could be bad with out a torn boot, they do tend to vibrate when they go bad, its kinda like a double U joint.
