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Search google for 'lincoln locker' or 'weld differential' and you'll find some info. One article recommends grinding the spiders to accept a square chunk of steel, but it's overkill to me. I just had an experienced welder buddy of mine do it with 220 MIG, no extra metal required. I've got it front and rear.
No pics, but will be if we do it to another Jeep. Just weld them spiders together, getting good penetration and filling all the gaps between the spider gears.[addsig]