I had my auto Trans fail on my 88 this spring from unrelated issues. The rebuilt tranny form GoWesty had a new cooler. I must admit my old cooler was pretty corroded. Replace it as a preventative measure? It depends on your risk tolerance, and how deep your pockets are. Are you a person that replaces all the hoses as a preventative measure? I am guessing most people would take the risk, but it sounds like a good idea if you are in this for the long haul.