AFTER PURCHASING THE VEHICLE NEW, WE NOTICED VIBRATION AT HIGH SPEEDS. FORD SERVICE FOUND NOTHING WRONG WITH THE EXPLORER. WHEN THE RECALLED WAS ANNOUNCED WE HAD THE LOCAL NTB TIRE COMPANY CHECK THE TIRES AS THE VIBRATION HAD BECOME VERY PRONOUNCED EVEN BEFORE THERE WAS 1500 MILES OF THE TRUCK. NTB RECOMMENDED REPLACEMENT OF THE TIRES. AT OUR OWN EXPENSE, BECAUSE THE FIRESTONE COMPANY REFUSED TO LOOK AT THE TIRES FOR 2 MONTHS (THEY WERE TOO BUSY AND WE HAD TO BE PUT ON A WAITING LIST) WE HAD NTB REPLACE THE WILDERNESS AT TIRES WITH MICHELIN TIRES. THE VIBRATION IMMEDIATELY CEASED. THE TRUCK RIDES SMOOTHLY AND WE HAVE HAD NO MORE PROBLEMS. FIRESTONE REFUSES TO DISCUSS TAKING THE TIRES BACK EVEN THOUGH WE EXPLAINED THE PROBLEM WE WERE HAVING.( DOT NUMBER: 8XHL TIRE SIZE: P235/75R15 )