Product Description
Build your own rebuild kit for the Muncie M20/M21/M22 manual transmission. Chevelle, Camaro, Corvette, Nova, GTO, Firebird, 442, GS etc. Pick the overhaul kit that matches your case, then add only the parts you need.
Build your own MUNCIE rebuild kit: choose the parts that match the transmission on your bench and leave out what you don't need. This builder has 10 option groups and 33 choices, all optional, so the kit holds only what you pick.
What you can choose
- Choose Your Overhaul Kit: BK116WS Master kit: bearings + seals + gaskets + small parts + brass synchro rings (most popular); BK116 Bearing, seal, gasket & small parts kit (no synchro rings)
- Add Individual bearings: 304240B Input bearing, 80mm OD, standard duty (Nachi)
- Add Synchronizer assemblies: 304703K Complete synchro assembly, 1-2 or 3-4 position; ATWT297-2.5 Synchro hub only, 1-2 or 3-4
- Add Extra synchro rings & keys: 304701A Brass synchro ring, stepped (1966-74) - each; 304701-2K Synchro key & spring kit, 1-2 and 3-4
- Add Input shaft: 304670F Input shaft 26T, 10-spline, close ratio (M21/M22 1966-70); 304670B Input shaft 21T, 10-spline, wide ratio (M20 1966-70); 304670D Input shaft 26T, 26-spline, close ratio (M21/M22 1971-74); 304670C Input shaft 21T, 26-spline, wide ratio (M20 1971-74)
- Add Cluster gear: 304674C Cluster gear 27-22-19-17, close ratio (M21/M22), 1" pin; 304674B Cluster gear 25-22-19-17, wide ratio (M20), 1" pin; WT297-3A Countershaft pin, 1" OD
- Add Mainshaft: 304672 Mainshaft, 27-spline output (1966-70); 304672A Mainshaft, 32-spline output (1971-74)
- Add Mainshaft & reverse gears: 304581 1st gear 36T (M20/M21); 304582 2nd gear 30T (M20/M21); 304583A 3rd gear 27T (M20/M21); 304587 Reverse gear 35T; 304819 Reverse idler gear; 304819A Front idler gear 18T; 304820 Reverse idler shaft
- Add M22 "Rock Crusher" conversion & complete gear kits: 304580CK M21 -> M22 6-piece gear conversion, 26T 10-spline close-ratio input; 304580CAK M21 -> M22 6-piece gear conversion, 26T 26-spline close-ratio input; 304580B Close-ratio gear kit 2.20 1st, 10-spline, 1" pin; 304580A Wide-ratio gear kit 2.52 1st, 10-spline, 1" pin
- Add Seals, gaskets & small parts: 304002 Gasket & seal kit; 304000 Gasket set; 344073 Shifter shaft seal (each; 3 needed); 304001A Small parts kit, 1" pin (snap rings, thrust washers, cluster needles); 304798 Input shaft nut; 304997A Speedometer drive gear, 8 teeth
