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I'm pretty sure if you have one cooler that is the one they are refering to as "auxiliary (additonal, supplimentary)." It used to be that there were very few vehicles with oil coolers (tranny or engine) and now that many new vehicles have them them they are called auxiliary.There wouldn't be two trans coolers that I know of. If your truck is a 4x4 I'm willing to bet that is has the tranny cooler.
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