WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Cracked Inner Race
Courtesy of GENERAL MOTORS CORP.
Cracked race due to improper fit, cocking, or poor bearing seats. Replace the bearing. Correct bearing seats.