Mishimoto Performance Transmission Cooler for 2003-2009 Dodge Ram 2500/3500 (5.9L / 6.7L) MMTC-RAM-03SL

Fits 2003-2009 Dodge Ram 2500 and 3500 models equipped with the 5.9L or 6.7L Cummins diesel engine.

Heat is the primary cause of transmission failure, especially in heavy-duty towing and fleet applications. The Mishimoto MMTC-RAM-03SL is a direct-fit performance transmission cooler designed to provide superior thermal management for your 48RE or 68RFE transmission. This cooler features a heavy-duty stacked plate core, offering significantly more surface area and fluid capacity than the restrictive factory unit.

A critical upgrade in this design is the serviceable thermostat. While the OE cooler’s thermostat often fails in the closed position—bypassing the cooler and sending hot fluid back to the transmission—the Mishimoto unit features a fully serviceable thermostat that can be easily bypassed for constant cooling. A convenient port at the top of the cooler allows for quick maintenance or bypass adjustment in minutes without removing the entire assembly.

• Direct-fit for 2003-2009 Dodge Ram 2500/3500 Cummins
• 212% increase in core volume compared to stock
• 244% increase in fluid capacity
• Durable stacked plate core construction
• Serviceable and bypassable thermostat design
• Top-mounted port for easy thermostat access
• Manufacturer Part Number: MMTC-RAM-03SL