Wehrli 17-19 L5P Duramax Billet Anodized Transmission Cooler Thermostat Bypass Plug

If you're working on a 2017-2019 Duramax L5P truck, especially one that does a lot of towing in warmer climates, you might be looking for ways to keep transmission fluid temperatures in check. This billet aluminum thermostat bypass plug from Wehrli Custom Fabrication is designed to replace the factory thermostat, which can sometimes fail and force transmission fluid to bypass the cooler. This can lead to dangerously high fluid temperatures, whether your transmission is stock or has been upgraded.

This bypass plug is CNC machined from billet aluminum and features a black anodized finish for durability. By reducing the restriction to the transmission cooler, it can help lower fluid temperatures by 15 to 50 degrees Fahrenheit. It's a straightforward installation that can make a notable difference in keeping your transmission running cooler under load. The kit also includes high-temperature silicone O-ring seals to ensure a solid seal. It's designed as a direct replacement, and you can easily swap back to the OEM thermostat if needed for colder weather conditions.

This part fits a range of GM trucks and SUVs equipped with the factory transmission cooler thermostat bypass, including models like the Chevrolet Silverado 2500HD and GMC Sierra 3500HD. It's a practical modification for anyone looking to improve the reliability of their transmission during demanding use.