4.0 LITER W/O TORQUE VECTORING. Ring o-ring. A seal that prevents oil from leaking out, or contaminants from enteRing the Differential Housing. A threaded rod with a drive head (such as hex, 12 point, torx, etc) on one end used to secure the Differential Housing to it's mounting point. Part cannot be reused/reinstalled. Assembly mount bolt. Housing O -. Drive shaft o -. Protector o -. Seal. Included with: Differential Assembly.