PARKED IN THE DRIVEWAY AHEAD OF MY WIFE'S CAR. STARTED THE FORD EXPLORER AND PUT IT IN REVERSE, NOTHING HAPPENED, IT DID NOT ENGAGE. THEN ALL OF A SUDDEN IT ENGAGED AND LEAPED BACKWARDS INTO MY WIFE'S CAR. SINCE THIS IT HAS HAPPENED SEVERAL MORE TIMES. I HOPE THAT A PERSON ISN'T STANDING BEHIND ME WHEN IT HAPPENS. *TR