saginaw
Thanks for the feedback on the saginaw, this transmission raises many questions, some seem to hold up and soom seem to fly apart- maybe its a quality control issue of the metals that were used during manufacturing, I also thought that the saginaw trans division made the muncie type trans under license(maybe Fran can answer this)
As far as the M21, my brother had one in a 67 GTO 400/360hp which he continously beat on the street and the drags and sold it with over 100k miles without touching the trans, syncros or gear oil. It was a bone stock high 13.95s car. Maye the only thing that saved the trans were the Firestone 500 tires which never really hooked up very well. Now that i think of it, the Casler slicks didnt work too well either.