aFe Power Rear Diff Cover (Machined) 12 Bolt 9.75in 97-16 Ford F-150 w/ Gear Oil 4 QT

The supplied gear oil (4 quarts) exceeds the performance requirements of API GL-5 recommended for both open and limited slip applications. This cover has an increased oil capacity over stock for better performance over a longer duration. Built-in internal and external fins transfer heat from the oil to the outside air for maximum cooling. This cover incorporates a magnetic drain and deep reach fill plug to capture loose particles for maximum protection. A calibration plug is set to the factory oil level to prevent overfilling. Included oil level sight glass allows quick and easy oil inspection.