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Reverse Boost Valve KitPart No. 47740-38K 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 Drop-in Zip Valve™ parts install quickly and easily Contents Valve Sleeve