Front Differential Cover - Heavy-Duty Cast Aluminum - GM 2500 HD 11-22Covered by a limited lifetime warranty. Help keep your 2011 current GMs front differential running cool and clean with an upgraded differential cover from PPE. With the largest set of cast cooling fins in the industry, found both inside as well as outside the pan, PPEs differential covers offer fluid cooling capabilities not often matched. This pan also holds an extra three quarter quart of fluid, offering a bit of added stamina on those long hauls.