Thread missing? 8-3/4 housing end as welded for shortened housing...

THere were a couple old drag racers that used to narrow housings. They were crude but they worked without issues. They always said that if the axles slid in easily it was close enough. A torch, a grinder, a stick welder and 3 jack stands. Right or wrong, that's how they did them.
Yup....I've seen some really rough narrowing jobs over the years. I have a narrowing jig and was surprised to see just how much a housing can move just by doing some welding on it and yup, most of the rough ones still worked well most of the time. Anyone that welds on spring pads for instance just do not realize how much doing that makes the housing move.