Find the Direct-Fit Transmission Coolers & Lines you need to keep the transmission cool in your 2001-2004 Chevy/GMC 6.6L LB7 Duramax. Most aftermarket transmission cooler give you greater cooling efficiency by an increase in core volume and fluid capacity. Replace the problematic factory thermal bypass valve (if equipped) with a performance transmission cooler thermal bypass valve. Get OEM replacement cooler lines or performance braided hoses with billet -AN fittings for your vehicle. Industry-leading brands such BD-Power, Mishimoto, Dorman, and more are offered.
