THE BEARING BRACKETS THAT HOLD THE FAN CLUTCH ON EXPLODE SENDING THE FANS INTO THE RADIATOR. WHEN THIS OCCURS YOU HAVE LIMITED BRAKES AND STEERING. THIS IS NOT FIRST ONE TO DO THIS TO ME. THIS TIME THE TRUCK CAUGHT FIRE BECAUSE OF HOW HOT THE PARTS WERE. ALL OF THE FAIL ON THE CUMMINS ENGINE. EACH TIME HAS BEEN AROUND 65MPH . THE SHOPS LAUGH ABOUT IT BEING ANOTHER WHEN YOU TOW IT IN. THANKS RICHIE