Just had both rears and seals done by the dealership I work for, took the poor guy 5.5 hours when they only quoted me 3.9. Either way, they did everything I asked, de and regreasing the bearings, etc. On the way home, I was a bit miffed to hear that wonderful zzzzt sound yet again, definitely from the rear. Not nearly as frequent as it used to be, but still distinctly there. Is this just a temporary thing as the bearings settle and grease distributes? The buzzing did seem to get less frequent after a couple miles, and overall drivetrain noise has definitely been reduced, but that buzz still raises the hairs on the back of my neck. If this isn't normal for the first day or two of driving on new bearings, guess it'll be time to go in and have them repacked again.