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Boost Valve KitPart No. 86940-05K In vehicles with Ford ATX transmissions, reduced/no line rise, delayed Reverse and flare 1-2, 2-3 upshift complaints can be caused by a worn boost sleeve. Wear at this sleeve allows leakage between the TV boost and reverse circuits. Sonnax boost valve kit 86940-05K eliminates this cross-leakage and restores the hydraulic integrity of the circuit. Sleeve is manufactured from highly wear-resistant aluminum to prevent wear Kit can be used to replace any of the OE boost ratio size variations Drop-in Zip Valve™ parts install quickly and easily Contents Valve Sleeve