aFe Power's front and rear differential covers bring performance and protection to your diesel or gas truck's front and rear end. The neodymium drain plug helps catch any lose particles, protecting your gears. These differential covers are constructed out of durable cast aluminum with reinforced ribs for maximum strength. aFe Power's rear differential cover helps protect against heat when towing by adding additional fluid capacity. The built-in internal or external fins transfer heat from the fluid to the outside air for maximum cooling.