Regear the differential in your 2006-2007 Chevy/GMC 6.6L LLY/LBZ Duramax with an all-in-one kit. The races, seals, bearings, and ring & pinion set you need for installation are included with these kits. These kits are available in a wide variety of gear ratios to suit your needs, truck application, and tire size. Get high-quality brands like Yukon Gear & Axle and Nitro Gear & Axle.