I would think it is NOT a good idea to run in a tap, if the hole goes into the rear end.
in other words, a non blind hole, as the cuttings/$hit will go into the differential.
Granted, they might wind up in the filter eventually after circulating in there and causing undue wear.
A tap will not restore threads to original size.
If the threads are pulled out/stripped, things need to come apart and the damage addressed.
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