i would assume that it is something inside the tranny yet again...i have not heard of this rivet before but if the output shafts are like that and that rivet pops out i would suspect a lot more issues then just when in reverse...i would assume other grinding banging would be going on...i would aslo like to think more along the lines of missing teeth as another has put it but it poses another issue to me that if it was missing teeth then it would want to stop driving for a quick second or it would have trouble with reverse...when you put it in gear and hold it does it grind or is the backup motion smooth? if it backs up smoothly then not a gear problem...if it grinds then a missalligned gear is most likley a suspect... as for it popping out of gear i would assume more missalignment...if it grinds as backing up and pops out then the whole mechanism could be missaligned or tottaly shot...im not an expert by anymeans but from what i know about transmissions i come to those conclusions
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