Toyota/Lexus vehicles equipped with U660E and U660F transmissions often exhibit several common concerns related to wear in the lockup control valve bore. Oscillation of the lockup control valve and stroking of the plunger valve in its sleeve results in wear that prevents full hydraulic control of the lockup circuit. TCC slip, RPM surge, harsh downshifts and slip codes can accompany the TCC apply/release concerns which develop in these cases. Sonnax oversized lockup control valve kit 47740-30K allows the bore to be refurbished, restoring normal TCC operation.

Hardcoat anodized aluminum valves combat premature wear
Annular grooves help center valves in bore and sleeve to reduce future side-load wear

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