Vehicles with Toyota/Lexus U760E and U760F transmissions may exhibit insufficient line rise in Reverse, delayed or slipping Reverse, and/or burned C3, B1, and B4 clutches. Continuous oscillation of OE steel boost valve within aluminum boost sleeve causes premature wear, creating a path for boost pressure to exhaust. Installing improved material Sonnax reverse boost valve kit 47740-38K restores the hydraulic integrity of the boost circuit to recover normal Reverse operation.

• Restores proper line rise
• Annular grooves help center valve in bore to reduce future side-load wear
• Hardcoat anodized aluminum valve combats premature wear
• Sleeve manufactured from highly wear-resistant aluminum to prevent excess wear and leakage