aFe 19-25 GM Trucks Front Diff Cover - Black w/ Machined FinsThis differential cover has an increased oil capacity of approximately 1 2 quart more 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 greater cooling capabilities. This cover incorporates a magnetic drain plug to capture loose particles for improved protection. Included calibration plug is located at a specific height preventing any overfilling and taking