I would just get a new auburn posi unit and new gears .
The shop that you have do the gear and posi install should weld the axle tubes in better and while there at it rede the upper control repair if it looks like it needs it.
There’s no sense in shelling out money for a used posi rear and stuffing it with new parts if yours is still usable!
Any original 8.2” rear with what maybe a good posi will not be good for long anyway and then your almost back at square one anyway!
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