Image of the Mishimoto Performance Transmission Cooler for the 2019+ RAM 6.7L Cummins installed.

Long Haul – Performance Transmission Cooler for 2019+ RAM 6.7L Cummins

Picture yourself on the shoulder of the highway. You noticed the gears slipping a few miles back but decided to ignore it because you were only a few miles from home. Those slipping gears turned into violent lurches, and before you knew it, your 2019+ RAM 6.7L Cummins was sporting a Christmas tree dashboard and that dreaded burnt smell. Your transmission is toast.

But it didn’t have to be this way—if you had the Mishimoto Performance Transmission Cooler, you’d have made it home.

A side-by-side image comparing the Mishimoto Transmission Cooler and stock.
FIgure 1. A side-by-side comparison of the Mishimoto Transmission Cooler and stock.

Our new transmission cooler for the 2019+ RAM 6.7L Cummins is a direct-fit application that offers improved cooling capabilities and seamless integration into your truck’s transmission system. Our cooler’s core is 64% thicker than stock and uses three additional rows of fins for peak efficiency. To maximize the cooling potential of the enlarged core, our engineers decided to use high-efficiency internal fins that add more cooling surface area and ensure improved fluid-to-tube contact. The core’s tube-and-fin construction minimizes pressure drop and allows for rapid heat transfer during varying loads—a huge benefit when towing.

An image of an engineer installing the Mishimoto transmission cooler.
Figure 2. Anthony installing our transmission cooler.

These improvements make for a significant upgrade over stock, and our testing confirmed this. Results from bench testing showed lower inlet temperatures compared to the stock cooler. This demonstrated that our cooler is more effective at maintaining low temperatures across the entire system, not just from inlet to outlet. 

An image of an engineer conducting bench testing for our transmission cooler.
Figure 3. Mike conducting bench testing.
A chart showing results from our bench test that reveal our cooler has lower inlet temperatures over stock.
Figure 4. Results from our bench test showing lower inlet temperatures over stock.

In addition to performance gains, our engineers also wanted to ensure an easy installation process. The direct-fit design means you can reuse OEM transmission lines and mounts with no cutting or trimming required. Thanks to the bolt-on mounting tabs, the radiator and A/C condenser can remain in place during installation. Our engineers went a step further and included OEM-quality quick-disconnect fittings to really make this installation a breeze.

With proven performance improvements, a design specifically engineered for easy installation, and the peace of mind from our Lifetime Warranty, our Performance Transmission Cooler for the 2019+ RAM 6.7L Cummins is a must-have to keep that Aisin transmission cool. Make sure you make it home from the next long haul and order yours today.