All necessary fittings and cut cooler lines for your 727, 46RH, A518 transmission cooler line replacement.

Power Driven Diesel has developed this 727 46RH A518 transmission cooler line replacement kit to resolve the common issue of leaking or damaged factory transmission cooler lines.

Our kit includes all the necessary fittings and hose to completely replace the factory steel lines with new 1/2" ID cooler lines. The factory routing is maintained, starting at the transmission, then to the heat exchanger on the passenger side of the engine, then forward to the factory air-to-oil cooler in front of the radiator, and back to the transmission. Premium rubber-coated line clamps enable a clean and secure installation. We have updated the kit to include an adapter that accommodates non-standard ports on aftermarket 89-02 heat exchangers. Additionally, the fittings without hose are now available in kits for applications where cooler circuit components have been added, relocated, or deleted.

This transmission hose is proudly made in the USA and rated for 300° F and 300 psi, the perfect hose for replacement transmission cooler lines. We have logged 100k miles over the course of 5 years on this same hose without incident on a hot rod Cummins tow rig with a built transmission. It truly is the best hose we’ve ever found for transmission cooler line usage. Additionally, we have also made the line available by the foot for custom applications.

We have found most commonly-available hose to fall short when it comes to transmission cooling lines. If you use whatever hose your local auto parts store has, chances are it will fail within a couple years!

View Installation Instructions Here

The 727 46RH A518 Transmission Cooler Line Kit is Compatible With:

*May not work for all builds due to other engine/vehicle modifications

Check out the video below for more information.

Looking for 68rfe? The 68RFE Transmission Cooler Line Replacement Kit Will Get The Job Done.

At Power Driven Diesel, we’re on a mission to redefine diesel performance. Founded by Todd Welch and Will Terry, our team is driven by an unwavering passion for pushing the limits. From Todd’s towering presence in diesel drag racing to Will’s budget-friendly innovations, we’ve come together to form a dynamic force in the industry to give you the best products and best customer service in the industry.

Our commitment is simple: leverage knowledge, share insights, and provide cutting-edge solutions to enable everyone to build high horsepower builds. Power Driven Diesel is more than a brand; it’s a community of enthusiasts, innovators, and lifelong learners. Follow along on the journey to unleash the true power of diesel performance.