Shop Gear Install Kits & Components before installing new gears in your 2004.5-2005 Chevy/GMC 6.6L LLY Duramax. Master overhaul kits and master installation kits provide all the parts you need to get the job done. A large selection of bearings, shims, seals, gaskets, and crush sleeves are offered to help you to replace the gears or repair your differential. Shop all the top manufacturers including Nitro Gear & Axle, USA Standard Gear, Eaton, Yukon Gear & Axle, Dorman, Cometic Gasket, Mahle, and more!