A common problem in GM 200-4R and 4L60 transmissions is burned bands and/or 3-4 clutches. This failure can be reduced by eliminating throttle boost oil leakage. Sonnax TV boost valve kits 77917-02K (.423" dia.), 77917-03K (.471" dia.) and 77917-04K (.500" dia.) eliminate these problems in a variety of applications. For maximum pressure and shift feel for high performance applications, use Sonnax TV boost valve kit 77917-04K.
|Sonnax Part No.||Sleeve Dia.||Performance Applications|
|77917-02K||.423" dia.||Minimum line pressure for V6 applications and smaller vehicles|
|77917-03K||.471" dia.||Higher line pressure for towing and off-road|
|77917-04K||.500" dia.||Maximum line pressure and shift feel for high performance applications|
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.