I would say swap the frame.I am doing that on my project as my frame is completely rotted from the inside.The guy that had it never flushed out the frame , and with the buildup of mud in there , it just stayed damp.Thats the major problem with the box style frames we have , they can rust pretty fast.While you have the body off , if you plan on doing a body lift , thats the time to add one <img src="/forums/images/graemlins/smile.gif" alt="" /> I am also doing complete new brake and fuel lines while it is all apart , and sandblasting the good frame I have.