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

Had a friend in high school with a 71 Cougar, 351C, some performance parts, cam, headers, carb, etc. Had 3.70s in a 9 inch welded up, street drove it 12 months of the year, went through a LOT of rear tires. I drove it occasionally, was a ***** making tight low speed turns.