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Message: <blockquote data-quote="Marky Dissod" data-source="post: 26149" data-attributes="member: 13218">Depends on how heavy (and aerodynamically 'draggy') the thing you're towing is, and how hot and how uphill you're towing.Also, there are several electrical fan pair options, for heavy / intense hot towing up steep long hills you'd need to researchGMT900 electrical fan pairs with upgraded (thicker gauge) electrical wiring and a GMT900 alternator.If you're towing under 6000lb with 3.73 or 4.10 you don't need the most intense GMT900 electrical fan kit.If you're towing over 7000lb with less than 4.10, you may want one of the more intense GMT900 electrical fan kits.</blockquote>