The torque boxes are toast. I had to redo mine since my Jeep came with me from PA… so did the rust! Pocono Metal craft had excellent fitting boxes. Cut out the rust leave enough to weld the new boxes too. They also sell the frame sections. I’d clean out what you can and decide if you are keeping the Jeep, capping the sections, or frame swap… I know it sucks. I’ll eventually have to do it to mine too