aFe Power 46-70022-WL Pro Series Machined Rear Differential Cover with Gear Oil 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 deep reach 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 6 quarts of fully Synthetic 75W-90 group IV synthetic base oil which exceeds API GL-5 specs