DRIVER'S SIDE SEAT TRACK SUFFERED MATERIAL FATIGUE FRACTURE. SEAT FRAME IS A STAMPED METAL FRAME. THE CRACK HAPPENED ON THE FRONT LEFT LEG THAT ATTACHES THE SEAT TO THE FLOORBOARD. THE SEAT TRACK IS STAMPED BY A CHRYSLER DIRECTED SUPPLIER AND SHIPPED TO JCI FOR ASSEMBLY. SUGGEST CHRYSLER TO INVESTIGATE SEAT MOVEMENT (CAUSING FATIGUE IN THE BEND), MATERIAL THICKNESS AND THE POSSIBILITY OF ADDING A GUSSET (OR BRACE) ACROSS THE BOTTOM OF THIS BEND IN THE TRACK. THIS HAPPENED ON MY PERSONAL VEHICLE. I NOTICED SOME MOVEMENT IN THE SEAT BUT I THOUGHT IT WAS COMING FROM THE RECLINE FUNCTION. I WAS BACKING DOWN A HILL WHEN IT SNAPPED CAUSING ME (THE DRIVER) TO SUDDENLY TILT BACKWARD. I WAS STARTLED AND THE TRUCK BUMPED INTO THE MAILBOX AT THE END OF THE DRIVEWAY CAUSING A DAMAGED BUMPER. *TR