Tool Required VB-FIX Required
- Erratic TCC apply pressure
- Excess TCC slip
- Harsh TCC apply & release
- Low cooler & lube pressure
- TCC codes
Excess bore wear at the secondary pressure regulator valve allows critical pressure loss and/or valve hang-up.
Recover hydraulic control and revive TCC/lube/cooler pressures by reconditioning the bore and installing Sonnax oversized secondary pressure regulator valve kit.
Oversized Secondary Pressure Regulator Valve Kit
- End Plug
Vehicles with Toyota/Lexus U341E and U341F transmissions commonly have TCC problems such as harsh apply and release or excess slip, often accompanied by TCC codes. These issues can be caused by bore wear at the secondary pressure regulator valve, which allows vital fluid to escape the circuit. In addition, cooler and lube pressures can be negatively affected, resulting in overheating and lube failures. Reconditioning the bore and installing Sonnax oversized secondary pressure regulator valve kit 37740-07K restores critical clearances for renewed TCC, cooler and lube operation.
- Lengthened critical spool for added stability and wear prevention
- Hardcoat anodized aluminum valve combats premature wear