A worn secondary pressure regulator plunger valve sleeve in AS66RC and AS69RC transmissions can cause reduced SLT pressure, TCC codes and shudder and overheating.
The plunger valve is reacted on by SLT pressure, which allows throttle control of the converter charge circuit. As the OE sleeve wears, SLT pressure exhausts, compromising the converter charge circuit and resulting in the noted symptoms. Sonnax secondary pressure regulator plunger valve kits restore the hydraulic control and fix these issues.
- 122740-03K: Fits AS66RC gas units only with .255″ dia. plunger valve
- 122740-05K: Fits AS69RC diesel units only with .321″ dia. plunger valve