Not sure the brand of mine, the tranny shop who did my upgrade installed it. It's 32" and installed where the stock one use to be. Not very expensive, $138 and a hour install. I also installed a ATS deep tranny pan. I have pulled some heavy loads and has never gotten above 190 degrees even on the hottest day going up a big hill. Seems to run the hottest just motoring around town in stop and go traffic. Still never get above 190. Can get the name of the cooler if you want. ATS also sells an aftermarket one that is in addition to the stock one with an electric fan. Not sure of the price but looks easy to install. Call Wade at ATS for the price.I have a 2005 3500 HD 4wd and I am looking for an additional aftermarket trans cooler does anyone have any suggestions?