Late GM Muncie Transmission 1966-74 Rebuild Kit This transmission kit is one that fits all the 1966-74 GM Muncie Manual Transmissions with the 1" Countershaft Pin! You can identify this transmission by the cast aluminum case, 7 bolt side cover, it uses the 1" countershaft pin and an 80mm outside diameter input bearing. This kit comes with all the HD bearings, seals, gaskets, and small parts kit (That includes snap rings, thrust washers, needle bearings, etc.)