There are differences in the Spline Counts between a Muncie M-20, 21 and the "Rock Crusher M-22"! The Super T-10 and the Muncie M-22 share the same Heavy Duty Spline Count as a Turbo 400 Automatic Transmission. There is no way to slide a M-20 or M-21 Driveshaft Yoke into a Super T-10 or M-22 Tailhousing.
