{"product_id":"m20-4-speed-manual-transmission-7-8-inch-countershaft-bore","title":"M20 4-Speed Manual Transmission 7\/8-Inch Countershaft Bore","description":"The Muncie 3851325 is a 4-speed M20 manual transmission that utilizes the 3851325 main case casting, which was specifically produced for 1964 and 1965 model year applications. This unit is distinguished by its 7\/8-inch countershaft bore, an identifying feature common to these early production Muncie cases before the transition to 1-inch shafts in later models.\n\nEach transmission is supplied as a rebuilt unit, restoring the mechanical integrity and shifting performance of the original gearbox. It serves as a direct-fit replacement for vehicles originally equipped with the M20 wide-ratio 4-speed configuration during the 1964-1965 production window. Buyers should verify their existing transmission case casting number to ensure compatibility with their specific drivetrain setup.","brand":"muncie","offers":[{"title":"Default Title","offer_id":52663075733816,"sku":"3851325","price":221.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/687514153.jpg?v=1784323525","url":"https:\/\/store.motormia.co\/products\/m20-4-speed-manual-transmission-7-8-inch-countershaft-bore","provider":"MOTORMIA","version":"1.0","type":"link"}