How to remove gears from 489 case?

IMG_1882.JPG Hello
I have a complete 3rd member with 3.23 gears, 489 case, open diff (that was welded to posi and broke off)
Someone wants to buy just the case off me. The case and gears are still good.

How do I remove the gears and other components from the case so I can sell the good case?

Thanks!