Mishimoto 03-07 Dodge Ram 5.9L Cummins Replacement Transmission CoolerBrand Mishimoto Part Number MMTC RAM 03TQ Category Cooling Transmission Coolers Condition Brand New Original Manufacturer Packaging The factory transmission oil cooler on your 2003 2007 Dodge Ram 5. 9L Cummins is a liquid to liquid cooling unit, utilizing the engines cooling system to cool the transmission fluid during warm outside temperatures and warm the fluid during cold outside temperatures. This design is tried and true, and it works. Until it
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