Sonnax 57917E-01K Boost Valve Kit for Toyota U140E U140F U240E U241E Transmissions

The Sonnax 57917E-01K boost valve kit is designed to resolve common hydraulic control issues in Toyota and Lexus vehicles equipped with U140E, U140F, U240E, and U241E transmissions. These transmissions may exhibit insufficient line rise in the drive ranges and excessive high pressures in Reverse, often caused by wear between the steel boost valve and cast-aluminum sleeve.

Key Features:

• Boost sleeve manufactured from highly wear-resistant billet aluminum to prevent the excessive wear exhibited by the cast OE sleeve
• Hardcoat anodized aluminum valve combats premature wear
• Minimal clearances to prevent wear and restore proper hydraulic control
• Drop-in replacement design for straightforward installation

This kit addresses the root cause of boost valve failure by upgrading both the valve and sleeve materials. Continuous oscillation of the steel boost valve within the cast-aluminum sleeve creates excessive wear and a path for EPC and Reverse pressures to leak. The Sonnax solution uses premium materials engineered to withstand the demanding operating conditions and restore proper transmission line pressure control.