Whiney Wheel Bearings?

please dont take this the wrong way but you do know whow to pack a wheel baring??? and is the noies in the front or the rear..Artie
Yes I know how to pack a bearing, I'm guessing perhaps the rear end since when I hit a speed bump earlier it stopped for 1/2 of a second when my rear end bumped the speed bump. (speed bumps around here are like curbs)