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  1. firestopper

    Rear spring mount (FWD) frame crack repair.

    Fish plating is common when splicing frames etc. Basically the material used would be the same thickness of the parent metal. The sides would be twice the distance as the height of the plate. As for points, I was taught to radius them. If you do use points then don’t weld the tips of said...
  2. firestopper

    Rear spring mount (FWD) frame crack repair.

    Good morning and thank you for the compliment. First let me begin by stating that I'm not a structural engineer or metallurgist but what I can share is 43 plus years of welding and fabrication. I have worked with many smarter, more experienced men over the years and have been blessed with shared...
  3. firestopper

    Rear spring mount (FWD) frame crack repair.

    Looking at the background of the photo, you can see the boxed portion of the frame. These sections run from the forward rear spring perch to the nose of the frame. Held in with rivets and a welded cross member that penetrates the outer frame (also welded). Not impossible but certainly...
  4. firestopper

    Rear spring mount (FWD) frame crack repair.

    Your first photo demonstrates exactly why simply welding won't fix the problem. The welds appear to be of quality but the continuation of flex (stress cycles) results in further cracking along the weld toe. The continuation of stress cycles will result in the parent metal becoming brittle...
  5. firestopper

    Rear spring mount (FWD) frame crack repair.

    The arrow points to the crack inside the frame on both sides. Removing all those rivets is doable but replacing them not so much. The cold rivet design allows for off-road flexing but once those rivets get loose then excessive flexing will lead to metal fatigue and failure. Stitch welding the...
  6. firestopper

    Rear spring mount (FWD) frame crack repair.

    The passengers aft view shows the vertical weld only on the OEM gusset. I don't like to weld perpendicular on any vehicle frame. Thats why a good fit up is important. No problem welding parallel on the frame (top). The front vertical weld is even shorter due to the OEM gusset (drivers side)...
  7. firestopper

    Rear spring mount (FWD) frame crack repair.

    Checking the fit and measuring for the center plate. It came to 3.125" wide by 5". A look at the profile. The rear section (A) also required a small relief for the rivet head to clear. The fit looking fwd. The corner weld will provide a strong joint. The inside box section was stitch welded...
  8. firestopper

    Rear spring mount (FWD) frame crack repair.

    As many know the problem with pre 80's 40 frames cracking due to excessive flexing ( cold rivets) and lack of proper support on the cantilever spring mount. This Arizona rig is cancer free and freshly sand blasted making it much easier to repair the crack and improve the spring mount design...
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