EE WAS ASCENDING A HILL TO REFUSE SITE WITH HIS INITIAL TRIP. HE DROVE APPROX. 500 FT. WHEN THE OUTPUT SHAFT BROKE COMING OUT OF THE TRANSMISSION. THE TRUCK STARTED COMING OFF THE HILL BACKWAR DS AND UPSET OVER A SMALL EMBANKMENT. EE WAS TAKEN TO ST JOSEPH'S HOSPITAL WHERE IT WAS FOUND OUT HE HAD TWO BROKEN RIBS.