I use a Tru-Cool H7B that I got from Jason White. Works great. I run the fluid thru the radiator first, then to the transmission cooler, then back to the transmission. You will need two lines and connectors on both ends to hook it up. You unhook the line leaving the radiator and run one steel braided line to the cooler from one end of the line you unhooked and another from the cooler back to the other end of the line you disconnected at the radiator.