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

Yes the mini spools usually state for off road only.
Uncle Tony's Garage welded up his 8 1/4'' in Project Bottle Rocket it went a few rounds and broke a axle.It's behind a 4 speed. He is now going to a 8 3/4 SG.
If you do weld it up and drive in dirt only I would bet you won't break it.