Shop Differential Covers and upgrade the axle in your 2006-2007 Chevy/GMC 6.6L LLY/LBZ Duramax. Cast covers can offer added benefits such as increased fluid capacity, integrated cooling fins, and additional strength over the steel factory cover. Differential Covers are typically available as an upgraded cast and machined design and as a stamped steel replacement. Check out all 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!