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Protect the 48RE or 68RFE in your 2003-2009 Dodge Ram 2500/3500 5.9L/6.7L Cummins with the Fluidyne High Performance Upgraded Transmission Cooler. Excessive heat is one of the biggest transmission killers on trucks that tow, haul, or put power down, and the factory cooler is barely adequate for stock applications. The Fluidyne stacked plate cooler offers three times the core area and three times the fluid capacity of a traditional tube-and-fin cooler for superior heat dissipation and stable temperatures under heavy loads.
This kit pairs the RT-48-0309 cooler with its required Fluidyne line kit, TLK.68.0709, so everything needed for the install arrives together. Wrapped in a high-temp silicone jacket and finished in stealth black, these -8AN steel braided lines are as tough as they are clean. Upgrading to a real transmission cooler means not choking it with the factory -6AN lines, and this kit is built to move serious fluid without restriction. It is a no-nonsense fit for 68RFE-equipped trucks that get used.
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