GREX Transmission Oil Cooler Kits help prolong the life of your oil and in turn your internal transmission components. Hard driving causes higher transmission temperatures. Factory oil coolers are normally small devices crammed into the factory radiator. This design taxes the transmission cooling system even under normal driving conditions. GREX Transmission Oil Cooler Kits are an excellent addition, and are especially effective in harsh driving environments. By using a similar inner-fin core design as GReddy famous intercoolers, GREX is able to increase transmission oil capacity, decrease transmission temperatures, and extend transmission and oil life. The efficient core and durable steel-braided lines ensure good flow and a leak free installation.