PPE HEAVY DUTY FRONT ALUMINUM DIFFERENTIAL COVER BRUSHED GM GMC CHEVY 2011+ 9.25 IFS 2500HD/3500HD - 138041010 ? Cast from high grade aluminum alloy ? 1/4 inch external cooling fins ? 5/8 inch internal fins, ? 3/4 additional quart capacity ? Stainless Steel 17mm hex head drain plug with a 1 inch Neodymium magnet that attracts and holds harmful ferrous metals