WHILE I WAS EXITING MY TRUCK, WITH MOTOR OFF AND TRANSMISSION IN PARK, THE PIN THAT HOLDS IT IN PARK FAILED AND ALLOWED THE TRUCK TO ROLL BACKWARDS. THIS SCOPED ME UP IN THE DOOR AND DRAGGED ME OVER THE HILLSIDE NEXT TO THE ROAD. I HAD TO ESCAPE FROM THE DOOR BEFORE IT RAN INTO TREES, AND IN THAT PROCESS DISLOCATED MY LEFT ELBOW AND TWO RIBS ALONG WITH NUMEROUS BRUISES. THE TRUCK IS AT A REPAIR SHOP TO REVIEW WHAT HAPPENED TO ITS PARK GEAR.*AK