This is the all new, redesigned replacement case for all Muncie M20, M21 & M22 transmissions 1963-74. Please specify pin size when ordering.
This case has a thicker front flange bolting area for added strength.
transmission main case
drain plugs with O rings
front countershaft plug
new, improved stronger Input bearing
Optional Case w/ "thrust Button" has hardened insert in front of case for added cluster pin support(for high HP applications). It eliminates the front thrust washer and selas the front counter pin hole.