I have never even ONCE seen someone break the roll pins that retain the shift forks
on the shift rails, NEVER.
I have never seena "broken" fork,never, not even once.
I HAVE seen, about a dozen times, a shift fork worn on one side or the other
(once BOTH) to the point where it wouldn't shift INTO a gear, but never to the point where it couldn't be shifted out.
What I have seen, and rarely DO NOT see, is worn shifter pivot bushings
that allow the "ball" at the bottom of the shift lever to float to the point where the "finger" below the ball will slip out of the "Gate" in the shift rail ends and thus not be able to pull the trans out of gear.
I have also seen several transmissions where it was driven so long in this condition
that the shifter hole in the top cover and the "finger" itself were so work that they were only repairable by melting them and starting over.
AD