aFe Pro Series differential covers bring performance engineering to the protection of your axle's differentials. The durable cast aluminum construction with reinforced ribs provide maximum strength, while the machined fins and textured powdercoating provide a distinctive look. aFe Pro Series differential covers are available individually for front or rear with or without PRO Guard D2 synthetic 75W-90 oil and in complete sets with front, rear, and oil. Features: * Increased oil capacity * Internal/external ribs/fins transfer heat from oil to outside air for maximum cooling * Dual neodymium magnetic plugs--magnetic drain and deep reach fill plug—capture loose particles for maximum gear protection * Large oil level sight glass allows quick and easy oil inspection * Calibration plug set to the factory oil level to eliminate overfilling