Front Cover fits AA 14-9.25; Rear Cover fits AA 14-11.5; Cast Aluminum Internal and external cooling fins; Separate fill and drain ports; Magnetic drain plugs; Stainless steel allen head cap bolts and fill plugs; Engineered cover design keeps oil on the gears (Rear); Deflects oil back onto the ring gear and into the pinion gear for cooler longer life (Rear); Extra capacity sump located at bottom for gears to pick up oil (Rear); Gasketless cover has integral re-usable Viton O-Ring (Rear)