zgeezer Posted April 13, 2011 Share Posted April 13, 2011 Read somewhere that automatic transmission life is greatly affected by AT fluid temperature. Twice the life at 140 degrees than at 200 degrees or something like that. So, I went shopping at my favorite JY looking for a 280zxt small cooler. Found and purchased a second generation Rx7 oil cooler for $35.00 including lines and banjo fittings. This thing is huge: 5" x 2"x 22', including a thermostat set to open at 165 degrees or so. This is just about as wide as my Chevy radiator. All aluminum. Now, this will be my AT cooler and I hope to keep the fluid temperature down to the 145-150 degrees or so. I live in the low desert of CA, so high ambient temperatures are a fact of life. I expect to plumb this by running it in series with my radiator AT cooler. In the radiator from the AT, out of the radiator and into this cooler, and then out back to the AT. I expect my LM7 will run water temperatures around the 195 degree range. The Mazda oil cooler's integral thermostat opens at 165 degrees or so:too hot for my purpose. Does anyone know if there are replacement thermostats for the Mazda Rx7 cooler that open in the 140 or so range. If not, can I simply remove the thermostat and replace it with a bolt. Any comments are welcome. G PS where in the "help" section does it explain how to post photos to this thread? Quote Link to comment Share on other sites More sharing options...
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