aFe Power's new rear differential cover brings performance engineering to the protection of your axle's differential. This differential cover is constructed out of durable die-cast A380 aluminum with reinforcing ribs for maximum strength. This cover comes with all necessary hardware and includes an O-ring for a leak-free seal. The differential cover includes an oil level sight glass and deep reach magnetic dip stick for maximum protection. This cover is finished in wrinkle-black powder-coating for a distinctive look. 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 magnetic drain plug to capture 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. Group IV synthetic base: This competition proven formulation utilizes a group IV synthetic base along with a proprietary additive package that reduces drag, resist foaming and maintains its viscosity under extreme heat and high loads. Usage: The PRO Guard D2 Synthetic 75W-90 limited slip gear oil exceeds the performance requirements of API GL-5 recommended for both open and limited slip applications. Note 1: This cover fits the Ford 9.75-12 Bolt Axles. Note 2: Some Ford F-150 Trucks have other rear axles, verify axle type. Note 3: Will not fit Ford Lightning or Harley-Davidson models. Fits: 1997-2016 Ford F-150 V6/V8 models. When it comes to engineering for power, performance, protection and value, aFe Power is the only choice.