Give your 2006-2007 Chevy/GMC 6.6L LLY/LBZ Duramax the Transmission Fluid it needs to service your vehicle. Using a quality fluid provides you with smooth gear changes and contains additives to prevent the formation of corrosion, rust, and foam. These fluids, which are available in synthetic and conventional, help to extend service life while reducing harmful heat and wear. XDP carries high quality fluids from Sun Coast Converters, Royal Purple, Hot Shot's Secret, and Lucas Oil.