The Toyota/Lexus U660E/F, U760E/F transmissions may exhibit harsh 4-5 upshifts/downshifts, delayed reverse or neutral to drive engagement due to wear in the clutch control valve bore. A common wear location in the bore is at the outboard spring pocket, where SL1 pressure works with the spring to keep the valve bottomed in the bore. The resulting SL1 leakage diminishes fluid pressure to the sequence valve and C1 clutch, creating delayed engagement.

Wear at the inboard bore area can allow SL2 pressure loss, resulting in diminished fluid pressure to the C2 clutch and 4-5 or 5-4 shift flares or harshness.

The Sonnax oversized clutch control valve kit 47740-22K allows the bore to be refurbished and the hydraulic integrity of the circuit to be restored.

• Hardcoat anodized aluminum valve combats premature wear
• Annular grooves on the valve help center it in the bore to reduce future side-load wear