Might have figured it out. Can't believe didn't notice until now. The nut that locks on the reverse box is gone. Spun off again. Not sure how long it's been. But been a little bit, by looking at bolt. Maybe long as been having issue? Could be.
Only thing keeping it on was the holding bracket. Had lock nut on it. Not sure why 2nd time this happened. So guess need to put lock tight on it?
At least guessing this my issue with the jarring.
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