WHEN DRIVING MY 2002 EXPLORER, THE CABIN HAS A POUNDING SOUND WHEN DRIVING OVER ANY UNEVEN SURFACE, JUST LIKE A BOOMING STEREO. IT DOESN'T EVEVN HAVE TO BE A LARGE BUMP OR BUMPS. AFTER ABOUT 5 MINUTES OF THIS NOISE, I END UP GETTING A HEADACHE. THIS HAS NEVER HAPPENED BEFORE IN ANY OTHER VEHICLE. I CAN ATTACH A LETTER I SENT TO FORD WITH NO REPLY. *AK