I am putting a 502 in my 67 and have the m-21 4 spd. How will it hold up? What about m-22 conversion?

With some narrow street tires and no banzai clutch dumping it should survive. Slicks and high rpm launches, you're on borrowed time.

Really doubt the M-22 will last much longer. If it doesn't hook don't worry about it.

I have NO way of knowing if my gut feeling is right or not, but I go by this!!

M-20 = about 425 T;

M-21 = about 450 T;

M-22 = about 500 T; and

the new "bells and whistles" Autogear w/ the Supercase, Italian gear set and steel mid plate

M-22 = about 600 T or just a a schosh higher...

And I do have to think that both the old Ford cast-iron Top-Loader/RUG and the old MOPAR A833 are stronger than our M-22, but not by much!!

As always, jmho..

You need a better stick than this and you'd better be looking at a G-Force or whatever it is??

pdq67