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Originally Posted by jbglenn
Plenty of folks here have had the tranny overheat towing heavy loads with the tow mode on. If you start to overheat turn the tow modeoff and leave in the right gear for the grade. Do a search and others will share the overheat info with you. Have fun
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Tow mode is not a replacement for using the right gear, all it does it change the shift points of the trans during acceleration. I definitely recommend 3rd gear when going up hills on the freeway (Keep the RPMs up), the problem with the trans heating up is lower RPMs not providing enough fluid flow. Dropping down a gear and bringing up the RPMs cools it down almost instantly since the fluid in the pan is at a much cooler temp.