I'm sure someone will disagree with this, but if it were me, I would replace the housing as the Dana 30 is a common unit. I'm surprised it cracked on the short side as they are more common to crack on the long side. Yes, you could weld it, but what else is bent/damaged that caused the crack or is a result of the crack? If you have high miles on yours and find a good used one, swap it straight up if your gears match, OR rebuid it and have a solid axle when done.
1975 CJ-6 304 T15 Dana20 30/44 3.73
1983 CJ-8 258 T5 300 30/44 3.31 Looking for full or half hardtop buy or trade
1986 CJ-7 Laredo 4.6 stroker T5 300 30/44 3.31
1986 TJ-7 Trail Jeep project in the works
2003 Inca Gold TJ Rubicon