aFe Power's new rear differential cover brings performance engineering to the protection of your rear axle's differential. This differential cover is constructed out of durable die-cast A380 aluminum with reinforced ribs and wrinkle black powder-coating with machined fins for maximum strength and styling. This cover comes with all necessary hardware and includes an O-ring for a leak-free seal. This cover fits the 12 bolt-9.75 rear differential. 5 quart lube capacity: This cover has about a 5 quart lube capacity at the factory line, factory cover holds about 4 quarts. Built-in Internal/external Fins: Built-in internal and external fins transfer heat from the fluid to the outside air for maximum cooling. Magnetic drain/fill plug: This system incorporates a large magnetic drain and fill plug that captures loose particles for maximum rear-end protection. Oil Level Sight Glass: Pre-installed large oil level sight glass with calibration plug set to the factory fluid level to eliminate overfilling. When it comes to engineering for power, performance, protection and value, aFe Power is the only choice. Note: This differential cover fits 97-15 Ford Trucks with the 12 bolt-9.75 differential. Modifications may be required on 2010 and earlier vehicles.