THE 10-SPEED 10R80 AUTOMATIC TRANSMISSION THAT IS LOCATED IN MANY F150'S IS DEFECTIVE AS IT CAN SHIFT HARSHLY AND ERRATICALLY AT VERY HIGH SPEEDS, CAUSING VEHICLE CONTROL LOSS AND CAUSING ACCIDENTS. THE VEHICLE WILL OFTEN JERK, LUNGE, AND CAUSE LOSS OF CONTROL AS SOMETIMES IT WILL STOP ENGAGING. FORD DEALERS ARE HESITANT TO REPAIR THE PART AND NEGLIGENT WHEN IT COMES TO THE SAFETY OF THE DRIVERS. OFTEN NOT BLAMING IT TO THE FAULTY TRANSMISSION BUT OTHER 'NON RELATED FAULTS' THAT HAVE OCCURRED IN THE TRANSMISSION, HENCE NOT PROVIDING FREE REPAIR.