I think I know why you found it "interesting." You need to index the gears so the welds "try to mesh," (they can't) that's what locks the rear. This particular method was covered in an issue of Circle Track magazine.(circa 1993-94) It was written about a "mini-stock" differential, but my assistant and I incorporated into my Chevy rear end. I sold my stock car in 1998, the new owner was still running that rear end in another car he built, after totaling mine out. I tried to search that article without luck. I do know that we did not weld any gear to each other or to the cage. BTW: This is based on what I can best remember. (grin)
Norm
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