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Message: [QUOTE="dirk0, post: 732904, member: 11503"] As I posted before, I noticed 25-40 degree lower oil temps depending on the ambient temps\load in the back. The radiator in these trucks shed heat like crazy. I learned that when a fan clutch decided to come apart right as I got to the house one afternoon. After using an air chisel to remove the damn thing, I drove the truck 20 miles to work in stop and go traffic as well as back home in the Texas summer heat. I couldn't run the A/C, but the truck never over heated. Trans temps were higher, but I had a 30k derale remote cooler with it's own fan, so it wasn't a big issue. So.. If the tstat is full flowing at 180 degrees instead of 203-205, the radiator is already removing that heat fairly quick. Oil is able to stay cooler. Even trans temps are a slight bit lower. Also, anything over 35-40mph, the fan isn't really doing anything unless you're pulling a lot of weight and it's hot out. Pulling a '35 TT, I only hear the fan kick in a few times on trips. The cooling system on a 7.3 is a beast. [/QUOTE]

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