Complete M-20 or M21, Muncie 4 Speed Transmission. This is the 26 spline input shaft (clutch spline), 32 spline output shaft (know to some as the "400" output). This is an original M20 or M21 that will work well for many applications such as Chevelle, Camaro, Buick, Pontiac, Corvette ect. This unit has all new gears as well as new bearings, brass, small parts, thrust washers, bushing, seals, sliding clutch's, forks,  countershaft and bearing retainer. Case, shift cover, midplate and extension housing are all cleaned and renewed with our in house proprietary system.  Big IN, big OUT, M20 or M21, YOU CHOOSE M20, (2.52), OR M21, (2.20), WITH A NOTE IN THE ORDER, or, CALL TOLL FREE TO SPEAK WITH ONE OF OUR REPRESENTATIVES. Comes with our 12 month NON ABUSE warranty. SHIFTER SHOWN IS FOR DISPLAY ONLY AND NOT INCLUDED WITH THIS UNIT. Shifters are available and can be quoted based on your application data. TOLL FREE 1-877-614-GEAR