2017-2019 Silverado & Sierra 2500 & 3500 Duramax L5P Bypass Valves

Ironically, one of the smaller parts of your Duramax L5P's Allison transmission causes some of the biggest problems with these tough trucks. The OEM thermostatic transmission valve can get clogged or fail to open after some decent mileage which blocks fluid flow from your transmission to the transmission cooler, leading to possible limp modes and premature transmission failures. Tier One's selection of thermostatic bypass valves for 2017-2019 Silverado & Sierra 2500 & 3500 Duramax L5P trucks completely remove the thermostat element from the valve, removing a potential failure point and allowing for the full flow of fluid to your transmission cooler at all times. The end result is improve reliability and lower transmission fluid temperatures for your Duramax truck's Allison transmission. Make sure you also check out our 2017-2019 Duramax L5P Transmission Coolers or our 2017-2019 Duramax L5P Transmission Pans!