[Dragncar]

I have a 69 GTO that had a M21 and kept popping out of 1st gear and the linkage would get stuck in second on the 1-2 shift if I banged it hard.
I put a Ford Top Loader in it. Even came up in the right place stock console after some modifying.
You could not tell a thing unless you looked under your car.
Muncies are not all that strong, 65 pounds compered to 115 pounds.
There are some aftermarket Italian "Muncies" that the die hard 4 speed guys use at the track that are real tough.
The Top Loader does not shift as smooth as the Muncie did.
I have a aluminum Borg Warner in my 79 Trans Am and it does not shift as smooth as the Muncie did either. Tough looking tranny though, has a giant output shaft.
But I took it out and put a T350 in the car.