8 3/4 auburn grip and loc carrier. broken parts question

yeah which means that pin has turned through near 90* but there should be a bolt close to one end of the pin that stops it turning it bolts in from one side of the case. that bolt must be snapped or missing i.e backed out due to vibration. allowing the pin to turn and put pressure on the central button until its small mounting stud snapped

what caused the twist in that shaft? it will dictate what work you need to do.
i have seen the type like my one above have the dowel hole that they use instead of a bolt wallowed out. and signs of smearing of spider gear onto shaft i.e a semi seizure.
was on a one for 2.77:1 gears so useless case hemispheres for any other application. the good parts became spares

you won't know till you pull it apart. but they are simple units, it will be obvious
lets hope the bolt just fell out
it should be in the bottom of the axle housing unless it got pinged down one axle tube or the other

Dave