Get the Transmission Fluid you need when servicing the transmission in your 2004.5-2005 Chevy/GMC 6.6L LLY Duramax. These fluids, which are available in synthetic and conventional, help to extend service life while reducing harmful heat and wear. A quality fluid helps to provide smooth shifting, while including foam, rust, and corrosion inhibitors. Royal Purple, Hot Shot's Secret, Lucas Oil, and Sun Coast Converters are just some of the manufactures XDP offers.