This Eastwood Complete Manual Transmission Kit includes all necessary bearings, seals, gaskets, synchronizers, springs, and bushings needed to rebuild your Muncie M20, M21, M22 with 10 spline input and 27 spline output shafts and 1in. diameter countershafoot Designed specifically for 1966-67 casting number 3885010, 1968-70 casting number 3925660 and 1970 casting number 3925661. A detailed exploded view is included. Factory shop manual suggested - professional installation recommended. Made in the USA.