2004.5-2005 GM 2500HD/3500HD 6.6L LLY Duramax Differential Covers

The factory sheet metal differential cover on your 2004.5-2005 GM 2500HD/3500HD is susceptible to damage. We offer a fantastic selection of aftermarket differential covers that enhance maintenance, provide a sleek appearance, and improve your differential's cooling and durability all in one package. Many of these GM differential covers boast higher capacities than the stock version, along with built-in cooling fins that help regulate temperatures during aggressive driving or heavy towing. Best of all, most of these differential covers come with built-in drain and fill plugs, making it much easier to change your GM's gear oil. Pair your heavy-duty differential covers with our selection of Skid Plates for additional protection!.  GM Duramax Fitments: 2004, 2005 GM 6.6L Duramax. Submodel Fitments: WT, Custom, LT, LTZ, High Country, 1LT, 2LT, Pro, SLE, SLT, AT4, Denali. Some exceptions apply, please see individual product pages for specific fitments.