MY 2004 FORD EXPLORER HAS HAD A PROBLEM WITH CHATTERING IN THE DIFFERENTIAL AND DELAYED SHIFTING OF THE AUTOMATIC TRANSMISSION GEARS, ESPECIALLY REVERSE, SINCE IT WAS PURCHASED. WHEN I AM IN AN URBAN PARRALLEL PARK SITUATION, I HAVE HIT THE CAR BEHIND ME HARD ON SEVERAL OCCASSIONS BECAUSE OF THE DELAYTED SHIFTING. AS YOU SHIFT, YOU NATURALLY PUT A FOOT ON THE ACCELERATOR. WHEN THERE IS A DELAY, THE CAR THEN BOLTS INTO REVERSE AT A HIGH SPEED. I HAVE BROUGHT MY CAR TO THE DEALER 5-6 TIMES, AND THEY HAVE ALWAYS DONE SOMETHING, BUT NOTHING EVER WORKS TO ELIMINATE THE CHATTERING AND THE DELAYED SHIFTING.*AK