99 Silverado front end wobble

can anyone tell me, what could be causing my front end to wobble as if it were unbalanced (tires), although my tires and alignment are fine/good? I heard it's my wheel bearings that are the problem and that they are sealed therefore, I would have to change the wheel hub. Can someone elaborate or confirm?

your hub/bearings is one whole unit.. check ball joints tierod ends pitman arm ect.. changing the hub can cost you big bucks.. good luck