VEHICLE DESCRIPTION: CERTAIN 1996-1999 FORD CROWN VICTORIA POLICE, FLEET, NATURAL GAS, AND 1996-1999 LINCOLN TOWN CAR LIMOUSINE VEHICLES THAT WERE PRODUCED WITH A LOWER CONTROL ARM BALL JOINT CONTAINING A ONE PIECE BEARING; AND 1990-1996 FORD CROWN VICTORIA POLICE, FLEET, AND NGV VEHICLES AND 1990-1996 LINCOLN TOWN CAR LIMOUSINE VEHICLES THAT HAVE BEEN SERVICED WITH EITHER A BALL JOINT CONTAINING THE ONE-PIECE BEARING OR A FRONT LOWER CONTROL ARM CONTAINING A BALL JOINT WITH A ONE-PIECE BEARING. THE ONE-PIECE BEARING WITHIN THE LOWER CONTROL ARM BALL JOINT CAN WEAKEN SLOWLY DURING USE AND EVENTUALLY CRACK. THIS COULD RESULT IN SEPARATION OF THE BALL AND CAP OF THE JOINT, ALLOWING THE CONTROL ARM TO DROP TO THE GROUND.