Intercoolers - Radiators - Condensers | 2025-2026 Ram 6.7 Cummins

The cooling and charge-air system on your 2025–2026 Ram 6.7L Cummins has a direct impact on how much power the truck can make, how hot it runs under load, and how reliable it will be over time. The factory intercooler, radiator, and related components are designed to meet a broad range of uses and emissions requirements, but they often run hotter and more restricted than necessary once you start towing heavy, running tunes, or pushing the truck beyond stock. Whether your goal is lower intake temperatures, better transmission cooling, or just more confidence on long grades, upgrading this side of the truck is one of the most effective ways to improve real-world performance and durability.

The intercooler is the first major component to consider for performance and reliability. Its job is to cool the charged air coming from the turbo before it enters the engine. Cooler, denser air means more power, better throttle response, and reduced risk of heat-related performance loss. The Mishimoto Performance Intercooler Kit for 2019–2026 Ram 6.7L Cummins is the primary intercooler upgrade in this category. It features robust cast aluminum end tanks and a dense bar-and-plate core that is significantly larger and less restrictive than the factory unit. This design improves heat transfer and reduces pressure drop across the intercooler, helping the engine maintain consistent power and lower intake temperatures even under heavy towing or repeated hard pulls.

Supporting the intercooler, charge-air piping upgrades help ensure that hot and cold sides of the system flow efficiently from turbo to intake. The AFE BladeRunner Aluminum Hot and Cold Charge Pipe Kit for 2025–2026 Ram 6.7L Cummins replaces restrictive factory plastic and thin-walled tubing with smooth, mandrel-bent aluminum piping. This reduces turbulence and restriction in the charge-air path, allowing the turbo to move air more efficiently and helping the intercooler do its job more effectively. For owners who want to go further, Wehrli Custom Fab’s 3.5-inch Hot Side Intercooler Pipe Kit for 2019–2024 Ram 6.7L Cummins offers an even larger diameter option on the hot side, reducing backpressure ahead of the intercooler and supporting higher flow levels from tuning or other modifications.

Engine cooling is just as important as charge-air cooling, especially on trucks that tow heavy or operate in hot climates. The Mishimoto Performance Aluminum Radiator for 2019–2026 Ram 6.7L Cummins is a direct-fit upgrade designed to improve heat rejection over the factory unit. Its all-aluminum construction and increased core capacity help keep coolant temperatures more stable under load, reducing the risk of overheating during long climbs, extended idling, or heavy towing. Paired with the Mishimoto Aluminum Expansion Tank for 2019–2026 Ram 6.7L Cummins, this setup provides a more robust and durable cooling system that can handle higher demands while maintaining consistent operating temperatures.

Coolant system upgrades also include upgraded hoses and filtration. The Mishimoto Silicone Coolant Hose Kit for 2019–2026 Ram 6.7L Cummins (non-H.O.) replaces factory rubber hoses with reinforced silicone units that resist heat, swelling, and degradation over time. This helps maintain consistent coolant flow and reduces the chance of failures under high heat and pressure. For additional protection, the Sinister Diesel Coolant Filtration System for universal applications can be adapted to help capture debris and contaminants in the coolant, reducing the risk of clogged passages, water pump wear, and radiator or EGR cooler issues over the life of the truck.

Transmission cooling is another critical area, especially on 68RFE and higher-torque applications. The factory transmission cooling system can struggle to keep temperatures in a safe range when towing heavy or running higher power levels. Multiple options in this category address that, including the Mishimoto Performance Transmission Cooler for 2019–2026 Ram 6.7L Cummins, which is a direct-fit upgrade designed to improve heat rejection and maintain safer transmission temperatures. The PPE 68RFE Bar and Plate Transmission Cooler for 2019–2024 Ram 6.7L Cummins offers another robust option, using a high-efficiency bar-and-plate core to maximize cooling capacity for heavy-duty use.

For more aggressive cooling needs, stackable and auxiliary transmission coolers provide additional capacity. The BD Xtrude Auxiliary Transmission Cooler and BD Xtrude Double Stacked Transmission Oil Cooler offer high-flow, high-capacity options for trucks that see serious towing, hauling, or performance use. The ATS Universal Transmission Cooler with dual fans is another heavy-duty choice, designed to be integrated into existing cooling setups where maximum heat rejection is required. To help manage warm-up and overall temperature control, the Mishimoto Transmission Cooler Thermal Bypass Kit for 2019–2026 Ram 6.7L Cummins allows the transmission fluid to bypass the cooler until it reaches operating temperature, reducing wear and improving efficiency in colder conditions.

For owners who want to add dedicated electric fan cooling, the Mishimoto Heavy Duty Transmission Cooler with Electric Fan provides a universal, self-contained solution that can be mounted in tight spaces or used as a supplement to existing coolers. The Mishimoto Universal Pulse-Width Modulated Fan Controller can be used to manage electric fan operation more precisely, allowing for better temperature control and reduced parasitic draw compared to simple on/off fan setups.

The benefits of upgrading your cooling and charge-air system go beyond peak power. Lower intake and coolant temperatures mean the engine can maintain performance longer without heat soak, especially during repeated towing, climbing, or hot-weather operation. Improved transmission cooling reduces the risk of overheating, slipping, and premature wear, which is critical for long-term reliability on high-mileage trucks. Better hoses, expansion tanks, and coolant filtration also help prevent common failure points in the cooling system, reducing downtime and repair costs over the life of the vehicle.

The key to building an effective cooling setup is matching components to your goals and usage. If you tow heavy or run tunes, start with an intercooler upgrade like the Mishimoto kit, then add charge pipe improvements and a higher-capacity radiator. If transmission temperatures are a concern, pair a direct-fit transmission cooler with additional auxiliary or stacked coolers as needed. For severe-duty or off-road use, consider adding coolant filtration, silicone hoses, and dedicated electric fan control to create a complete, robust cooling system. When everything is properly matched, you get a truck that runs cooler, makes more consistent power, and holds up better under real-world conditions.

Whether you are keeping a daily driver reliable, building a heavy tow rig, or chasing performance gains, upgrading your intercoolers, radiators, and related cooling components is one of the most impactful modifications you can make on the 2025–2026 6.7L Cummins. With the right combination of intercooler, radiator, charge piping, and transmission cooling, you can reduce heat, improve durability, and help your truck perform stronger mile after mile.