99 Silverado Shakes Like Unbalanced

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?

unfortinly its true its one whole unit however if theres no groan noise it can be something else lift up one wheel with a jack and put ur hands a 6o clock and 12 o'clock and at three and 9.check ur ball joints and pitman arm.. and conform that your self and look for avbnormal wear... it could even be bad shocks

saw it before then it was bad u joints. check the drive shaft balance.