833 Gear Pitting... Help!

You pull that out of a water-well did you?
I'd run that in an Early-A, behind a stock slanty; if;
If the cluster bore looked ok, and
You change all the bearings, and
you don't mind a lil noise, in first thru third. Direct will be quiet.
Just put some dyno oil in the box, no ATF.
Yes I would, cuz it only takes me 17 minutes to drop it down... on a hoist.