The 10L80 10L90 transmission cooler barbell bypass kit is a custom “barbell” manufactured by BET Performance to eliminate the cooler thermostat (bypass) found on late model 10L80, 10L90 and some Allison transmissions.
This transmission cooler barbell bypass kit fits:
- 10L80 / 10L90 2018 and newer
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
The 10L80 10L90 transmission cooler barbell bypass kit includes the cooler plug valve with both o-rings. Installation instructions are available by request.
Additional information
| Weight | 1 lbs |
|---|---|
| Dimensions | 6 × 4 × 4 in |




