The transmission in your JK Wrangler is practically the essence of what makes it a Jeep. The sturdy gear sets housed inside, transferring power from the engine, give the Wrangler its go anywhere, do anything attitude. Jeeps pride themselves on being ready for any situation, from the dusty trails to mall parking lots, but are they in it for the long haul? Where the transmission is the soul of the Jeep, keeping it cool can sometimes pose a challenge. True, there are plenty of means of maintaining transmission fluid cool with external coolers, but they won't do you any good if the fluid never makes it to the cooler. That's why a sturdy thermal bypass valve is essential for the Jeep JK Wrangler, along with a myriad of other Mopar products.
Before we dive straight into our new design, let's take a look at the who, what, and why of the thermal bypass valve. First, your automatic transmission is a collection of planetary gear sets,