Stripped Final Drive Drain Threads

[Grumpy Goat]

So the piece of thread that came off came from the housing and not the plug, correct? Sorry if I missed that point.

If that is the case then the threads don’t look to be cross thread damaged, but you may have a sealing problem since the underside of the plug head expects to bear up against a flat surface. Can’t hurt to ask a dealership service technician for advice. They may have come across this before. Some sort of crush washer gasket may hold but I don’t know how hot this gets, which would determine the material that can be used. Just some thoughts.