Find the Direct-Fit Transmission Coolers & Lines you need to keep the transmission cool in your 1982-2000 Chevy/GMC 6.2L/6.5L Diesel. 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. The cooler lines are available in factory replacement or performance durable braided hoses with billet -AN fittings. Industry-leading brands such BD-Power, Mishimoto, Dorman, and more are offered.