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As a direct replacement for the failure prone OEM thermostat, the Transmission Cooler Thermostat Bypass Plug can drop fluid temperature from 15-50 degrees F by reducing fluid flow restriction to the trans cooler. In the stock application, 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.
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 (6L80, 6L90, 8L90):
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Reviewed by: Matthew10/07/2020 02:11PM
Product ownership: Less than 1 month
Purchased from: Wehrli Custom Fabrication - WCFab
Comments:
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
Reviewed by: Joe01/24/2021 01:44AM
Product ownership: Less than 1 week
Purchased from: Wehrli Custom Fabrication - WCFab
Comments:
I have a 2018 l5p and it was a easy install. Trans temp ran 150 degrees with outside temp of 45 degrees before install. After install I saw 105 degrees with the same outside temp.
Reviewed by: Chris06/06/2021 03:27PM
Product ownership: Less than 1 week
Not purchased from: Wehrli Custom Fabrication - WCFabComments:
My transmission has usually ran 190-200 degrees at all times, whether I am just driving around or pulling a trailer. I installed this bypass and now my trans runs 105 on 90 degrees days running around and 150ish pulling my trailer. I should have put this in sooner.