In Toyota/Lexus U140E, U140F, U240E and U241E units, the steel OE solenoid modulator valve is prone to side-loading in the bore. This side-loading action, combined with repeated oscillation of the valve, prematurely wears the cast aluminum bore causing shift and TCC concerns. Sonnax solenoid modulator valve kit 57917E-13K restores normal solenoid supply pressures.

High-grade aluminum sleeve resists wear and provides porting to prevent valve side-loading
Hardcoat anodized aluminum valve combats premature wear, incorporates annular grooves to prevent side-loading
Replacement spring resets regulated pressure to OE specification

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