{"product_id":"yukon-gear-66-74-muncie-m-t-w-synchros-bearing-kit","title":"Yukon ZMMK116WS Muncie M20\/M21\/M22 4-Spd Bearing Kit w\/Synchros for 1966-1974 GM","description":"\u003ch4\u003eVehicle Fitment\u003c\/h4\u003e\u003cul\u003e \u003cli\u003e1966-1974 GM vehicles equipped with a Muncie M20, M21, or M22 4-speed manual transmission (cast aluminum case, 7-bolt side cover, 1\" countershaft pin, 80mm OD input bearing)\u003c\/li\u003e \u003cli\u003eCommon applications include Chevrolet Camaro, Chevelle, Nova, and Corvette; Pontiac GTO and Firebird; Oldsmobile 4-4-2; and Buick GS models built with this transmission\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFitment Notes\u003c\/h4\u003e\u003cul\u003e \u003cli\u003eConfirm your transmission matches the cast aluminum case, 7-bolt side cover, 1\" countershaft pin, and 80mm OD input bearing before ordering - other Muncie case variants use different bearing specs and are not covered by this kit\u003c\/li\u003e \u003cli\u003eFitment is determined by transmission identification, not by vehicle year\/model alone, since the same Muncie unit was installed across multiple GM platforms during this period\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFeatures\u003c\/h4\u003e\u003cul\u003e \u003cli\u003eComplete bearing and synchro rebuild kit for Muncie M20\/M21\/M22 4-speed transmissions\u003c\/li\u003e \u003cli\u003eIncludes all new bearings required for a full rebuild\u003c\/li\u003e \u003cli\u003eIncludes new synchronizer rings for smoother, more precise shifting\u003c\/li\u003e \u003cli\u003eIncludes new seals and gaskets to restore proper sealing after rebuild\u003c\/li\u003e \u003cli\u003eIncludes a small parts kit with snap rings, thrust washers, spacers, and needle bearings\u003c\/li\u003e \u003cli\u003eManufactured by USA Standard Gear for Yukon Gear \u0026amp; Axle\u003c\/li\u003e \u003cli\u003ePurpose-built for the 1\" countershaft pin, 7-bolt side cover cast aluminum Muncie case\u003c\/li\u003e \u003cli\u003eConsolidates all major wear components into a single kit for a complete rebuild in one order\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecifications\u003c\/h4\u003e\u003cul\u003e \u003cli\u003eTransmission: Muncie M20\/M21\/M22 4-speed manual\u003c\/li\u003e \u003cli\u003eApplication years: 1966-1974\u003c\/li\u003e \u003cli\u003eCase type: Cast aluminum, 7-bolt side cover\u003c\/li\u003e \u003cli\u003eCountershaft: 1\" pin\u003c\/li\u003e \u003cli\u003eInput bearing: 80mm outside diameter\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eIncluded Components\u003c\/h4\u003e\u003cul\u003e \u003cli\u003e1x Complete bearing set\u003c\/li\u003e \u003cli\u003e1x Synchronizer ring set\u003c\/li\u003e \u003cli\u003e1x Seal and gasket set\u003c\/li\u003e \u003cli\u003e1x Small parts kit (snap rings, thrust washers, spacers, needle bearings)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eProduct Description\u003c\/h4\u003e\u003cp\u003eThe Yukon ZMMK116WS is a complete bearing and synchro rebuild kit for the Muncie M20, M21, and M22 4-speed manual transmissions used across a wide range of GM performance cars from 1966 to 1974. Rather than sourcing bearings, seals, synchro rings, and small hardware separately, this kit bundles everything needed for a full internal rebuild into one purchase, making it a practical starting point for anyone overhauling a worn or noisy Muncie 4-speed.\u003c\/p\u003e\u003cp\u003eThis kit is built specifically for the later-style Muncie case: cast aluminum construction with a 7-bolt side cover, 1\" countershaft pin, and 80mm OD input bearing. Earlier Muncie variants and other GM 4-speed designs use different bearing and seal specifications, so correctly identifying your transmission case before ordering is essential to getting the right kit the first time.\u003c\/p\u003e\u003cp\u003eIt's a good fit for restorers and hot rodders rebuilding a numbers-matching Muncie in a Camaro, Chevelle, Nova, Corvette, GTO, Firebird, 4-4-2, or GS, as well as anyone refreshing a Muncie for a swap into a different chassis. Installation requires full disassembly of the transmission and is best handled by someone comfortable with manual transmission rebuilds or a transmission shop.\u003c\/p\u003e\u003cmeta name=\"description\" content=\"Revitalize your 1966-1974 GM Muncie M20\/M21\/M22 transmission with this complete bearing and synchro rebuild kit from Yukon.\"\u003e\u003cmeta name=\"keywords\" content=\"Yukon Muncie bearing kit, M20 M21 M22 transmission rebuild, 1966-1974 GM performance parts, complete synchro and bearing kit, manual transmission parts for Camaro, Chevelle Nova Corvette, transmission overhaul kit, GM 4-speed manual transmission components, Yukon Gear \u0026amp; Axle transmission kit, automotive rebuild parts.\"\u003e","brand":"Yukon Gear \u0026 Axle","offers":[{"title":"Default Title","offer_id":53864411955519,"sku":"YUKZMMK116WS","price":210.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/7308\/9343\/files\/3ac2e28dbe846525ef4088fee542e44bL.jpg?v=1782577441","url":"https:\/\/wcaperformance.com\/products\/yukon-gear-66-74-muncie-m-t-w-synchros-bearing-kit","provider":"WCA Performance","version":"1.0","type":"link"}