No I havent installed a tranny cooler but i would like to because last time I went to the beach I drove straight into the sand from a four hour highway drive and the tranny temp light came on. That was the first time ive seen the light but it wasnt even hot outside and now that I have been pulling the trailer alot when it gets hot soon im sure i will see it again. How do you install one and where do you put it? Are there any write ups on the net? Thanks