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After sleeping on this, I bet that bellhousing needed to be indexed even though it was stock, and was just a bit too far off



This , new bellhousing , it is not indexed to the engine . Original bellhousing are attached to the engine block when it is being machined and mated to it .

the vibration could have been anything, it should have been found.

I'll ask a dumb question, was there a cover on the bottom of that bellhousing? Also what was the source of that bellhousing, used replacement part or brand new? That doesn't look like a factory Chrysler bellhousing?

As far as the pinion angle, you say it's been like that since the 80's, but that doesn't mean it's correct, what were the rear springs ? Was the rear and original car rear or a modified truck rear?