Plan on pulling the complete rear, removing the axles, remove the remaining bolts, remove the axle tubes, then the fun begins. I've tried easy outs and pretty much everything else known to man. They break off flush at the point that the axle tube joins to the trans housing. Only thing that has worked for me is to weld a washer to the broken bolt and then weld a nut to the washer in order to remove the broken axel tube bolts. Your results may vary.
