[TheJDMan]

I currently have an M-21, M-22 and the T-10. I ran all of them on the street and strip at one time or the other over the past 40 years in different cars. I have rebuilt each of them and I can tell you that there is little significant difference between them. In fact, many parts are interchangeable. The T-10 was slick shifted by removing evey other slider dog and installing non-syncronized sliders and drag raced for 10 years with not so much as a missed shift. I could put any of the three in "Dust Off" but my shifter only fits the T-10.