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Hey, question... Is that same rivited piece on a F350 frame (maybe the same piece as a F150)? I can't remember how mine is... but I'm in the process of cutting a frame up, and if it's the same, your welcome to the piece I have (the rest is going to scrap anyway). Let me know and I'll take a look when I get home.
I had the exact same thing happen to my '85 4wd just recently. My friend is an excellent welder,ground notches along the cracks, drilled 3/16 holes at each
end of the cracks and welded everything up. It is still holding. You have to get the areas as clean as possible and get very good penetration. I think I am going to install a brace as well.