Different axles have different weak points. The Explorer 8.8 has a poor connection between the tubes and the diff and a (relatively) weak carrier. The CJ amc-20 has 2-piece axle shafts that can spin free. The Dana 35, well, the dana 35 has so many weak points that there's no telling where it might fail. The gears can start spitting teeth, the shafts can snap, the center pin can break, the carrier can crumble, the pinion shaft can snap, the U-joint straps can fail, or the axle as a whole can bend into a smiley face. :D