Dominate the dirt, gravel, or mud in your 2006-2007 Chevy/GMC 6.6L LLY/LBZ Duramax with Differential Carriers & Lockers. Rebuild your axles with empty carrier cases, or gain traction with lockers, spools, limited slip differentials, and more. 1/2-ton, 3/4-ton, and 1-ton products are available to fit your specific needs. USA Standard Gear, Yukon Gear & Axle, and Nitro Gear & Axle are just some of the top-tier companies you'll find.