Subframe repair(large pic warning)

Suspension, Steering and Chassis

  1. Nick Mailloux

    Nick Mailloux Well-Known Member

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    I finally decided to tackle the cracked subframe on my 73 swinger. I cut out the bad metal on the bottom where the rear kmember nut is and removed the nut. I ended up internally sleeving it with a piece of 3 by 2 inch 3/16th wall steel tubing. I did 3 3/8ths plug welds on the inner side and 5 on the outer side. Drilled the ends of the cracks and beveled them with a carbide bit in my die grinder. Then welded it all up and ground it smooth. This seemed more daunting than it actually is.

    If anyone ever needs to do this, I took some pictures that may help show what I did. Make sure to measure 500 times and cut once!

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    Last edited: Jun 23, 2022
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    • Ironracer

      Ironracer Gearhead

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      Whoop ass Job Man!
       
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      • Nick Mailloux

        Nick Mailloux Well-Known Member

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        Thanks brother! It's been on my to-do list for way to long.
         
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        • Ironracer

          Ironracer Gearhead

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          Right on Brother! Respect is Given, to a certain point, and Earned Afterwards. You, Sir, Have Earned mine! Honestly, that's a Slick Repair. Looks Strong as Heck
           
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          • Nick Mailloux

            Nick Mailloux Well-Known Member

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            Thank I really appreciate that. Frame work has always kind of freaked me out. I just grabbed the bull by the horns and did went for it. Turned out way better than I would have hoped for. I really learned that if I can do it, anyone with a welder and time could do it!
             
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            • Ironracer

              Ironracer Gearhead

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              What size steel did you use fer boxing that in? 3/16"?
               
              Last edited: Jun 23, 2022
            • RustyRatRod

              RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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              Looks really good, Nick!
               
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              • harrisonm

                harrisonm Well-Known Member

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                Great work, @Nick Mailloux . Quite impressive. Stop drilling the cracks is an excellent idea that a lot of people don't think about.
                I do have one question. In picture #5, I see what looks like the sleeve from #4 set into place. Are the pieces I see in pictures 6 & 7 the same parts as in 4 & 5 only with the nut installed and welded in?
                Congrats. Great repair.
                 
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                • Nick Mailloux

                  Nick Mailloux Well-Known Member

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                  3x2 3/16th wall. Went and measured and corrected my post!
                   
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                  • Nick Mailloux

                    Nick Mailloux Well-Known Member

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                    Thanks buddy!!!
                     
                  • Nick Mailloux

                    Nick Mailloux Well-Known Member

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                    Yes it's the same piece, I was test fitting it, and then marking where I needed to drill the hole for the kmember nut. And absolutely, I always drill the starts and ends of stress cracks, all it actually does is prevent it from spreading during the welding process. Added bonus is they are additional plug welds! The rear of the tube extends into the frame about an additional 1/2 an inch too, so even if the cracks come back, it will still be safe. Nothing can move!
                     
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                    • 72bluNblu

                      72bluNblu FABO Gold Member FABO Gold Member

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                      Nice work! :thumbsup:

                      Frame repair can definitely seem kind of daunting for sure, but really it's all just about measuring and making sure stuff stays where it's supposed to.
                       
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                      • harrisonm

                        harrisonm Well-Known Member

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                        I don't see those cracks coming back unless you try some General Lee jumps. Great work. You should include some text and make it a How To article.
                         
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                        • Ironracer

                          Ironracer Gearhead

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                          I'm just a Lowly Carpenter, but it looked like it was over an 1/8" and less than a 1/4".... just an edumacated guess..Awesome Job Man
                           
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                          • Kendog 170

                            Kendog 170 Let the boy go !

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                            Very nice thought out job.
                             
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