The stock thermostatic bypass for warming up the Allison quickly in cold weather conditions is a good idea in principle, but in practice we've seen the valve fail forcing trans fluid around the cooler in warm weather conditions that cause dangerous fluid temperatures for built and stock transmissions alike. We've been running this design on our shop development trucks and with our built transmissions successfully and are now making them available for purchase separately due to popular demand.
Recommended for trucks with stock or built transmissions and performing heavy towing in warm climates to help keep fluid temperatures in check.
The WCFab 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:
Reviewed by: Matthew10/07/2020 02:11PM
Product ownership: Less than 1 month
Purchased from: Wehrli Custom Fabrication
Cheap and easy Purchase for my 2019 lp5 gmc denali easy install took about 30 mins dropped my trans temp at least 20 to 30 degrees usually ran 190 degrees now 135 to 150
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