My experience with wheel bearings is that they will sound off before causing a vibration.. I'm pretty sure the vibration you are feeling isn't coming from wheel bearings. First thing is ALWAYS mistrust the wheel balance!! Next thing is the U-joints! But wheel bearings are way down on anyones balance list.
Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />

professional bovine relocation specialist