Chances are if the outer bearing was loose it may have uneven wear. If you are sure that the noise is coming from the bearings and not from the tires or road then replacing the bearings and races might be the fix.

__________________
Ray
1998 Mercedes E320, 200K Miles
2001 Acura 3.2TL, 178K Miles
1992 Chevy Astro, 205K Miles