I HAVE A 2004 MERCURY MOUNTAINEER AND THE TRANSMISSION IS VERY DANGEROUS, MY WIFE STARTED TO BACK UP AND PUT IT IN REVERSE AND THE TRANSMISSION HESITATED AND THEN SLAMMED INTO REVERSE CAUSING HER TO JERK AND THEN HER FOOT CAME OF THE BRAKE AND HIT THE GAS PEDAL CAUSING HER TO RAM A PARKED CAR BEHIND HER, AND THAT WAS JUST THE FIRST TIME .THE NEXT TIME I MYSELF WAS IN THE VEHICLE AND IT DONE THE SAME THING EXCEPT THERE WAS NOT A CAR BEHIND ME TO STP ME AND I WENT OVER A EMBANKMENT AND IF NOT FOR A TREE I WOULD HAVE GOTTEN HURT BAD , THE TREE STOPPED ME FROM GOING TO THE BOTTOM , AND IT STILL TO THIS DAY WILL SLAM INTO REVERSE, NOTHING HAS BEEN DONE WITH IT YET . I HAVE READ ON THE INTERNET THAT ALOT OF MERCURY MOUNTAINEER OWNERS ARE HAVING THE SAME PROBLEM THIS IS GOING TO GET SOMEONE KILLED IF IT HAS NOT ALREADY. *TR