Welded differentials.....who is willing to admit that they have done it?

I worked for a mom and pop small machine shop in Macon all through the 80s. The owner had a Chevy Monza drag car. Although it had slicks on the back, it was otherwise street legal. We actually used to go pick up parts in it from time to time. It had a spool in a Ford 9". I think it had like 33 - 19.50-15s on the back. You never knew it was a spool because the tires helped take up some of the slack. It drove pretty good on the street.