Vehicles with Toyota/Lexus U660E/F, U760E/F transmissions may exhibit converter apply/release complaints, slip codes, overheated fluid or a burned converter. These problems may be caused by continuous oscillation of the steel lockup control boost valve within the cast aluminum boost sleeve, creating excessive wear and a path for converter/cooler fluid to exhaust and the lockup control valve to stroke prematurely.

Sonnax lockup control boost valve kit 47740-06K has upgraded materials and minimal clearances to prevent wear and restore proper hydraulic control.

• Boost sleeve is manufactured from highly wear-resistant billet aluminum to prevent excessive wear
• Restores proper line rise