Compatible With: GM muncie transmission rebuild kit with synchro rings fits the GM muncie manual transmission with the larger 1 inch countershaft pin. You can identify this transmission by the cast aluminum case, 7 bolt side cover, it uses the 1 inch countershaft pin and an 80 millimeter outside diameter input bearing. This kit comes with all the bearings, synchro rings, seals, gaskets, small parts kit (That includes snap rings, thrust washers, needle bearings, etc.).