aFe Powers new rear differential cover brings performance engineering to the protection of your axles differential. This differential cover is constructed out of durable die cast A380 aluminum with reinforced ribs and wrinkle black powder coating for maximum strength and styling. This cover comes with all necessary hardware and includes an o-ring for a leak free seal. This cover has about a 5 quart lube capacity at the factory line; factory cover holds about 4 quarts. Built-in internal and external fins transfer heat from the fluid to the outside air for maximum cooling. This system incorporates a large magnetic drain and fill plug that captures loose particles for maximum rear-end protection. Pre-installed large oil level sight glass with calibration plug set to the factory fluid level to eliminate overfilling. Pro Series Rear Differential Cover Black w/ Machined Fins Dodge Diesel Trucks 94-02 / Ford Diesel Trucks 99-07 Dodge Diesel Trucks 94-02 / Ford Diesel Trucks 99-07