THIS IS NOT A SAFETY RECALL IN ACCORDANCE WITH THE SAFETY ACT. HOWEVER, IT IS DEEMED A SAFETY IMPROVEMENT CAMPAIGN BY THE AGENCY. VEHICLE DESCRIPTION: 1996-1997 4-WHEEL DRIVE CHEVROLET BLAZER, GMC JIMMY, AND OLDSMOBILE BRAVADA SPORT UTILITY VEHICLES. SOME OWNERS HAVE HAD TO PAY FOR REPLACEMENT OF THE UPPER BALL JOINTS THAT HAVE SEPARATED. GM IS PROVIDING A SPECIAL POLICY TO THESE OWNERS TO COVER UPPER BALL JOINT REPLACEMENT IF THE CUSTOMER FOLLOWED THE RECOMMENDED MAINTENANCE SCHEDULE FOR THE CHASSIS LUBRICATION AND THE VEHICLE STILL REQUIRED THE REPLACEMENT OF THE UPPER BALL JOINTS DUE TO SEPARATION.