Shop Differential Covers and upgrade the axle in your 2017-2019 Chevy/GMC 6.6L L5P Duramax. Differential Covers are typically available as an upgraded cast and machined design and as a stamped steel replacement. Aftermarket cast covers typically offer increased fluid capacity, integrated cooling fins, and additional strength over the OE stamped steel cover. Find the leading brands including Mag-Hytec, Dynatrac, ATS Diesel, BD-Power, PPE, AFE Power, Yukon, Banks Power, B&M, Nitro Gear & Axle, Dorman, and more!