This 2015-2018 Dodge RAM 6.7L Cummins Transmission Cooler is now on sale! Click here to check it out!

When we last saw our 2015-2018 RAM 6.7L Cummins performance transmission cooler, it was an aluminum box with 3D prints for ports. In this post, however, we'll be taking that box and turning it into a fully functional transmission cooler. But first, we need to recap how we got here and perform one more test.

In our last post, we finalized our design for our 2015-2018 RAM Cummins transmission cooler. Our performance cooler will use a tube-and-fin core like the stock unit, but to add cooling capacity, we'll be making our core 60% thicker than stock with a 112% larger core volume. We'll be improving the internal structure of the cooler by adding fins to the inside of the fluid tubes.  These fins make the cooler more efficient by adding surface area to the core. The more surface area, the more efficient the core can be. The fins also help move the fluid within the tube, ensuring more of it

One of our favorite parts of the R&D process is the design and prototyping phase. It's our first chance to see our products come to life and compare them to the stock parts. In our last post, we looked at the stock transmission cooler for the 2015-2018 RAM 6.7L Cummins. We learned that, compared to the 2003-2009 6.7L Cummins transmission cooler, the stock 2005-2018 transmission cooler is relatively simple. Two cylindrical end tanks connect the tube-and-fin core, and four mounting tabs secure the cooler to the radiator. The transmission lines connect to the cooler with two standard quick-disconnects.

In this post, we'll be designing our performance replacement for that stock cooler. Like our previous RAM transmission coolers, we're going to make use of every cubic inch of space possible. While Jason had the stock radiator out, he took measurements of both the stock cooler and the area around it in the cooling stack. From these measurements, Jason was able to design our transmission cooler