- Bushing wear
- Overheated converter
- Overheated fluid
- TCC apply concerns
- TCC slip
- TCC surge
Continuous oscillation within the sleeve causes wear which prevents proper hydraulic control of the secondary pressure regulator valve.
Installing Sonnax boost valve and sleeve restores critical tolerances to bring back normal operating conditions.
Secondary Pressure Regulator Boost Valve Kit
Converter-related issues common in Aisin AW TR-60SN (VW/Audi 09D) transmissions are often caused by wear at the secondary pressure regulator valve boost assembly. The boost valve continually oscillates within the sleeve to help properly position the inboard secondary regulator valve. This movement is controlled by line pressure control solenoid fluid acting on the boost valve in response to throttle pressure. The secondary pressure regulator valve controls pressure to the converter and lube circuits, so wear at the boost assembly can create excessive TCC slip, TCC surge, bushing failures and overheated fluid and converters. Installing Sonnax secondary pressure regulator boost valve kit 25741-36K will restore proper hydraulic control and eliminate these issues.