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I believe most automatics today have a smaller transmission cooler built into the radiator. This is two fold. It moderates the transmission to some extent. Warming it up in winter sooner, and keeping it closer to the water temperature for the cooling effect in summer.
I have my external plugged in line with the stock one. Like I said, for 40 bucks its worth it for piece of mind. I need to also get a gauge on mine. :/ I might try this for the lezzy afterwards too.
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