PERIODICALLY THE VEHICLE WOULD SHIFT TO RIGHT. DEALER WAS UNABLE TO FIND DEFECT. THEN, VEHICLE BEGAN TO MAKE LOUD NOISES. WHILE CONSUMER WAS DRIVING ON HIGHWAY VEHICLE SHIFTED VERY HARD TO RIGHT. CONSUMER LOST CONTROL OF VEHICLE, AND CRASHED INTO ANOTHER VEHICLE ON RIGHT. VEHICLE THEN FLIPPED OVER. GMC AND INSURANCE CO. CURRENTLY HAVE INCIDENT UNDER INVESTIGATION.*AK