It might seem I'm the only one to have this failure thus far

I even discussed it with onerippinturbo2 and he had never seen it ..
so must not happen often..

the little screws that hold the shift forks to the internal rods .. they are threaded for part of their length and the end is like a pin that fits into the hole in the rod..
- works fine ..

until repeated shifts crack the bolt where the pin shaped tip and the threaded section meet..
this means the unthreaded pin tip that fits into the rod ..
CAN DROP OUT . and fall into the gear parts as the threaded portion is screwed into the fork

something we want to avoid .. more so as we invest more in the transmissions..

so a fix might be a high grade bolt with a longer thread and a small thread tap .. real cheap insurance
better to drill out the broken bolt than replace the transmission

in my 555 it bounced along the top of the gearset until it got to the ring & pinion where it went through
- cracked the case at the bearing but didn't hurt the hardened gear parts

bolt tip looked like chewing gum in diff

if your power shifts have a "hammer on anvil" sound to them you need to know this ..