aFe Powers front differential cover brings performance engineering to the protection of your trucks front-end. This differential cover is constructed out of durable die-cast A380 aluminum with reinforced ribs for maximum strength. This cover fits the Ford F-250/F-350/Excursion Dana #50/60/61 Axles. This cover has a 3-1/2 quart capacity. Built-in internal and external fins transfer heat from the fluid to the outside air for maximum cooling. This system incorporates a magnetic drain plug to capture loose particles for maximum rear-end protection. Also included is a 1/8" NPT calibration plug that is set to the factory fluid level which eliminates accidental overfilling. Optional Accessories Available: Our optional oil level sight glass (Part Number: 46-00001) and deep reach magnetic fill plug (Part Number: 46-00002) are great additions to combine with this cover.