Oversized Lockup Relay Valve Kit

The Sonnax Oversized Lockup Relay Valve Kit is engineered to address common issues in U341E and U341F transmissions, including TCC apply and release problems, inadequate lubrication, and overheating. By restoring critical clearances within the transmission, this kit promotes renewed TCC control and operation. The kit contains an oversized relay valve, plunger valve, spring, and end plug, designed as direct replacements for OE components. Installation involves removing the OE parts and installing the new Sonnax components to recondition the valve body. Specific tools may be required for proper installation, and instructions are available from Sonnax. This kit is specifically designed for Toyota/Lexus vehicles equipped with U341E and U341F transmissions. It aims to resolve concerns such as no lockup, slipping lockup, or a TCC stuck on, as well as TCC codes that may arise from worn components.