Friend of mine turned his rear end into mush. They opened the pumpkin and showed him the teeth to his gears after they put them in a bucket. Probably the forward reverse rocking he did while stuck in the snow a couple of weeks ago. Anyways, he found a used rear end. He has a mid 90's ford ranger 4wd. I don't know much about this. There is a ring gear that has teeth on the outside of it that goes to a smaller gear and then to some sort of sensor. The wires to the sensor then must hook up to something under the dash or in the engine compartment. His old rear end doesn't have this. Does anyone know what this is?