6L80 6L90 8L90 Transmission Cooler Thermostat Delete | Full Flow Valve L5P
The Doctor Diesel USA Transmission Cooler Thermostat Bypass Plug is a quick and easy install and will work with the following range of GM vehicles equipped with a factory installed transmission cooler thermostat bypass (6L80, 6L90, 8L90).
Billet Anodized Trans Cooler Thermostat Bypass Plug For 17-19 L5P Duramax Diesel
2017-2019 Chevrolet Silverado & GMC Sierra 2500HD/3500HD with 6.6L Duramax Diesel. The Doctor Diesel USA Transmission Cooler Thermostat Bypass Plug is a quick and easy install and will work with the following range of GM vehicles equipped with a factory installed transmission cooler thermostat bypass (6L80, 6L90, 8L90).