aFe Power's new rear differential cover brings performance engineering to the protection of your trucks rear-end. This differential cover has a 5 quart lube capacity (factory cover holds 4 quarts) at the factory line , a magnetic drain plug, a magnetic tipped fill plug for maximum rear-end protection. Built-in internal and external fins transfer heat from the fluid to the outside air for maximum cooling. aFe has also designed a large oil level site glass with calibration plug set to the factory fluid level to eliminate overfilling. This differential cover is constructed out of durable die-cast A380-T6 aluminum with reinforced ribs and a wrinkle black powder coating with machined fins for maximum strength and styling. This differential cover fits AA-14-11.5 Axles.