Derale 13633 13 Row Series 9500 Plate & Fin Transmission Cooler KitVery popular with original equipment manufacturers for use on their towing applications, our Plate and Fin coolers feature strong furnace brazed construction embossed turbulators which maximize heat transfer while also minimizing pressure drop. This unit is perfect for light to medium duty use and occasional towing. It greatly extends transmission life by preventing heat related transmission failures, and improve shifting performance. Built with 5 8"