That cooler is not big enough to run 'stand alone'. It should be used as an auxiliary with the OEM transmission cooler. I ran AC condensers as a stand alone cooler. I also used a trans temperature gauge. I'm curious, those saying they have had no problems, do you have a trans temp gauge. It would be like saying you have no engine temp problems because you have no gauge. There may have been problems but since the transmission did not puke foam out the vent or completely fail, you don't know. The transmission is one of the most neglected and ignored components. The transmission is a very reliable component as delivered. If the use moves beyond 'grocer getter', cooler upgrade is cheap insurance. Sever conditions (as defined by OEM) such as performance, taxi, police, or trailer towing, require added cooler and shift kit type mods. Electric controlled transmissions modify shift points and firmness based on engine temp and load. Unfortunately, manual transmissions don't have on-the-go performance changes. All AODs should have an auxiliary cooler. Heat is #1 AOD issue. If you don't like transmission work, an ounce of prevention might keep it that way.