aFe Power 46-70022 Ford F-250/F-350 Rear Differential Cover (Machined; Pro Series) Has about a 5 quart lube capacity at the factory line, factory cover holds about 4 quarts Constructed out of durable A380 die-cast aluminum with reinforced ribs and wrinkle black powder-coated finish with machined fins Built-in internal and external fins, magnetic drain plug and large oil level sight glass with calibration plug set to the factory fluid level Fits 10.25 & 10.50-12 Bolt Axles Includes a fully machined groove to accept supplied O-ring