You are buying a custom “barbell” that we manufacture to eliminate the cooler thermostat (bypass) that is found on late model 6L80, 6L90, 8L90 and some Allison transmissions.

It fits:

  • 6L80 & 6L90 2014 up
  • 6L90 2016 up
  • Some Allison transmissions from 2017 to 2019

It features:

  • Simple to install, some models can be done on the vehicle
  • Greatly reduces the chance of transmission overheating
  • Full time cooler flow, no matter what the transmission temperature is
  • Allows for instant checking of transmission level after service once minimum required temperature is reached
  • Uses stock thermostat housing so no change to cooler lines
  • Can extend transmission fluid life

You get the cooler plug valve with both o-rings, instructions can be provided if necessary.