Mishimoto 03-09 Dodge Ram 5.9L/6.7L Cummins Transmission Cooler

There's no greater enemy for a transmission than heat. Whether your 2003-2009 Dodge Ram 5.9L / 6.7L Cummins is a dedicated tow vehicle, hardworking fleet truck, or a daily driver, you need to ensure that your transmission runs cool. Luckily, Mishimoto has developed a direct-fit transmission cooler to do just that. Our 2003-2009 Dodge Ram 5.9L / 6.7L Cummins transmission cooler utilizes a stacked plate core for durable and powerful cooling. With a massive 212-percent greater core volume, 244-percent increase in fluid capacity, this trans cooler is a huge improvement over stock 2003-2009 Dodge Ram 5.9L / 6.7L Cummins transmission cooler. The Mishimoto transmission cooler is not only larger than the stock cooler, but more reliable too. When the stock cooler's thermostat fails, it fails closed, bypassing the cooler and returning hot fluid to the transmission. Mishimoto has solved this common issue by making the thermostat in our 2003-2009 Dodge Ram Cummins transmission cooler fully serviceable and easily bypassed for constant cooling. A port located at the top of the cooler provides easy access to the thermostat for servicing in just a few minutes. Replacement thermostats can be purchased individually if needed Automatic transmission oil cooler designed to regulate fluid temperature and prevent overheating. Enhances transmission longevity, maintains performance, and features durable construction with a precise fit.

• Fits all 2003-2009 Dodge Ram 5.9L and 6.7L Cummins
• 244-percent Increase in fluid capacity
• 212-percent Increase in core volume

Ensure optimal transmission performance and longevity with the Mishimoto 03-09 Dodge Ram 5.9L/6.7L Cummins transmission cooler. Designed specifically for Dodge Ram trucks from 2003 to 2009, this direct-fit cooler features a stacked plate core that delivers durable and efficient cooling. Its larger core volume and increased fluid capacity—212% and 244% respectively—make it a significant upgrade over stock coolers, effectively managing heat to prevent overheating during demanding driving conditions. This cooler is ideal for tow vehicles, fleet trucks, or daily drivers that require reliable transmission cooling under heavy loads or extended use.
The Mishimoto transmission cooler is engineered with reliability in mind. Unlike stock units, which can fail closed and bypass cooling when the thermostat malfunctions, our cooler includes a fully serviceable thermostat that can be easily accessed via a port at the top of the unit. This design allows for quick servicing or bypassing if necessary, ensuring continuous cooling without risking hot fluid recirculation back into the transmission. The robust construction and precise fitment guarantee seamless installation and dependable operation, helping to maintain consistent transmission temperature and performance.
This transmission cooler is compatible with various Dodge Ram models, including 2006-2009 2500 and 3500 series, providing a versatile upgrade for those seeking to enhance their vehicle's cooling system. Its durable materials are built to withstand the rigors of heavy-duty use, making it an essential component for improving transmission lifespan and overall vehicle reliability. With the Mishimoto brand’s reputation for quality engineering, this cooler offers an effective solution for maintaining transmission efficiency and preventing heat-related damage in demanding driving environments.

Features:

• Fits all 2003-2009 Dodge Ram 5.9L and 6.7L Cummins

• 244-percent increase in fluid capacity for enhanced cooling

• 212-percent increase in core volume for improved heat dissipation

Fitment:
2003 Dodge Ram 2500 Laramie
2003 Dodge Ram 2500 SLT
2003 Dodge Ram 2500 ST
2003 Dodge Ram 3500 Laramie
2003 Dodge Ram 3500 SLT
2003 Dodge Ram 3500 ST
2004 Dodge Ram 2500 SLT
2004 Dodge Ram 2500 ST
2004 Dodge Ram 3500 Laramie
2004 Dodge Ram 3500 SLT
2004 Dodge Ram 3500 ST
2005 Dodge Ram 2500 Laramie
2005 Dodge Ram 2500 SLT
2005 Dodge Ram 2500 ST
2005 Dodge Ram 3500 Laramie
2005 Dodge Ram 3500 SLT
2005 Dodge Ram 3500 ST
2006 Dodge Ram 2500 Laramie
2006 Dodge Ram 2500 Power Wagon
2006 Dodge Ram 2500 SLT
2006 Dodge Ram 2500 Sport
2006 Dodge Ram 2500 ST
2006 Dodge Ram 2500 TRX4
2006 Dodge Ram 3500 Laramie
2006 Dodge Ram 3500 SLT
2006 Dodge Ram 3500 Sport
2006 Dodge Ram 3500 ST
2007 Dodge Ram 2500 Laramie
2007 Dodge Ram 2500 Power Wagon
2007 Dodge Ram 2500 SLT
2007 Dodge Ram 2500 Sport
2007 Dodge Ram 2500 ST
2007 Dodge Ram 2500 TRX4
2007 Dodge Ram 3500 Laramie
2007 Dodge Ram 3500 SLT
2007 Dodge Ram 3500 Sport
2007 Dodge Ram 3500 ST
2007 Dodge Ram 3500 TRX4
2008 Dodge Ram 2500 Laramie
2008 Dodge Ram 2500 Power Wagon
2008 Dodge Ram 2500 SLT
2008 Dodge Ram 2500 ST
2008 Dodge Ram 2500 SXT
2008 Dodge Ram 3500 Laramie
2008 Dodge Ram 3500 SLT
2008 Dodge Ram 3500 ST
2008 Dodge Ram 3500 SXT
2009 Dodge Ram 2500 Laramie
2009 Dodge Ram 2500 Power Wagon
2009 Dodge Ram 2500 SLT
2009 Dodge Ram 2500 ST
2009 Dodge Ram 2500 SXT
2009 Dodge Ram 3500 Laramie
2009 Dodge Ram 3500 SLT
2009 Dodge Ram 3500 ST
2009 Dodge Ram 3500 SXT

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: t
Units Per Sku: 1