TL*THE CONTACT OWNS A 2007 FORD EXPLORER. THE CONTACT STATED THAT WHILE DRIVING AT APPROXIMATELY 20 MPH, THE VEHICLE CRASHED INTO ANOTHER VEHICLE. THERE WERE NO INJURIES BUT THE VEHICLE WAS NOT IN DRIVABLE CONDITION. THE VEHICLE WAS TOWED TO AN AUTHORIZED DEALERSHIP WHERE TRANSMISSION FLUID WAS ADDED TO ALLOW THE VEHICLE TO SHIFT PROPERLY. THE CONTACT NOTICED SIMILAR TRANSMISSION PROBLEMS A MONTH LATER SO THE VEHICLE WAS TAKEN BACK TO THE DEALERSHIP WHERE THE TRANSMISSION OVERHAUL AND THROTTLE POSITION SENSOR WERE REPLACED. AFTER THE REPAIRS, THE VEHICLE WAS PARKED ON HILL AND IT SUDDENLY ROLLED DOWN. THE FAILURE MILEAGE WAS APPROXIMATELY 21,900.