Mishimoto Transmission Cooler
2003–2009 Dodge Ram 2500 / Ram 3500 5.9L & 6.7L Cummins
MMTC-RAM-03SL
Overview:
The Mishimoto Transmission Cooler is engineered specifically for the 2003–2009 Dodge Ram 2500 and Ram 3500 equipped with 5.9L and 6.7L Cummins engines. Designed to combat the detrimental effects of excessive heat on your transmission, this direct-fit cooler ensures your truck maintains optimal transmission temperatures under demanding conditions. Whether you’re towing heavy loads, operating a fleet vehicle, or pushing your Ram on the drag strip, Mishimoto’s transmission cooler provides reliable, efficient cooling to extend transmission life and improve performance.
Featuring a stacked plate core design, this cooler offers a substantial upgrade over the stock unit, delivering a 212% increase in core volume and a 244% increase in fluid capacity. These improvements translate to superior heat dissipation and enhanced durability, keeping your transmission fluid cooler and your drivetrain protected.
Key Features:
Built with durability and serviceability in mind, the Mishimoto transmission cooler incorporates several advanced features that set it apart from the factory cooler:
- Direct-fit design for seamless installation on 2003–2009 Dodge Ram 2500 and 3500 5.9L/6.7L Cummins models
- Stacked-plate core construction for robust and efficient heat transfer
- 212% increase in core volume compared to stock cooler for enhanced cooling capacity
- 244% increase in fluid capacity to maintain lower transmission temperatures
- Fully serviceable thermostat with easy access port for quick maintenance
- Thermostat bypass option with included stainless-steel plug for constant cooling in hot climates
- CNC-machined stainless steel hose barb fittings to replace corrosion-prone quick-disconnect fittings
- Includes transmission cooler hose for direct connection to stock soft-lines
- Eliminates common failure points found in OEM coolers, improving reliability
Construction & Design:
The Mishimoto transmission cooler is crafted from high-quality materials designed to withstand the rigors of heavy-duty use. Its stacked-plate core design maximizes surface area for heat exchange while maintaining a compact footprint. The cooler’s robust construction resists corrosion and physical damage, ensuring long-term durability. The inclusion of CNC-machined stainless steel fittings not only prevents the common issue of seized quick-disconnect fittings but also provides a secure, leak-free connection to your vehicle’s transmission lines.
Additionally, the cooler features a thoughtfully engineered thermostat system. Unlike stock coolers that fail closed and bypass cooling, Mishimoto’s thermostat is fully serviceable and easily accessible via a top-mounted port. This design allows for quick replacement or bypassing, adapting to different climate needs without replacing the entire cooler.
Installation & Fitment:
Installation is straightforward with the Mishimoto transmission cooler’s direct-fit design tailored for the 2003–2009 Dodge Ram 2500 and 3500 equipped with 5.9L or 6.7L Cummins engines. The kit includes all necessary hardware, CNC-machined hose barb fittings, and transmission cooler hose to connect directly to your truck’s existing soft-lines. This eliminates the need to remove or replace stubborn OEM quick-disconnect fittings, simplifying the installation process and reducing labor time.
Whether you’re upgrading a stock cooler or replacing a failing unit, this cooler fits perfectly without modifications, providing a hassle-free installation experience.
What's Included:
- 1 x Mishimoto Transmission Cooler (stacked-plate core)
- Fully serviceable thermostat installed with access port
- Stainless steel thermostat bypass plug
- CNC-machined stainless steel hose barb fittings
- Transmission cooler hose for connection to stock soft-lines
- Installation hardware and instructions
Ideal For:
This transmission cooler is ideal for Dodge Ram 2500 and 3500 owners who demand reliable transmission cooling under heavy loads or extreme conditions. It is perfect for:
- Towing enthusiasts who regularly haul trailers or heavy equipment
- Fleet operators requiring durable, maintenance-friendly cooling solutions
- Performance drivers who push their trucks in high-stress environments
- Owners in both cold and hot climates, thanks to the serviceable thermostat and bypass options
- Anyone looking to upgrade from the stock cooler for improved transmission longevity and reliability
