I had the rear cover on my 1979 F250 rear differential get torn at the bottom edge by a rock and didn't notice it until the rear started to make strange sounds. A friend replaced the cover and cleaned out all the loose metal chips. I bought a used differential but never got around to installing it in the truck and parked the truck out of sight, out of mind. Last fall I got the truck out of cold storage, got it started, repaired the brakes, and this past spring I started to use it to pull the dead cars out of the woods to scrap them. After the second car, the clutch started slipping, so I drove the truck back to its resting place and parked it. The next time that I tried to move it, it went about 4 or 5 feet and the rear locked up. When I took the cover off, the pin that connects the 2 spider gears had come loose and hit the inside of the differential housing. It was bent like a pretzel. The gear lube that was installed was thick, but it didn't help at all and now everything is junk. This is what is going to happen to Orange Power if he doesn't fix it properly now before the differential housing also becomes junk. Maintenance delayed is maintenance denied to the detriment of the machine.