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  • Leaf spring bolts

    Does any one happen to have the sizes for the front leaf spring bolts on the 60 birds? Shackles seem easy to find but I cannot find the size needed for the front bolts.

  • #2
    Normally the bolt and the bushing come together.
    https://www.macsautoparts.com/1959-1...ails_tab-title

    John
    John Pizzi - Squarebirds Administrator

    Thunderbird Registry #36223
    jopizz@squarebirds.org 856-779-9695

    https://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htm

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    • #3
      According to the parts book (part # 5780) it's a 7/16-20 X 3 9/16" long (at least for a 1959)
      .... I didn't measure one..just read it in the book.

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      • #4
        Perfect I can work with that as I will be putting new springs in which already have the front bushings

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        • #5
          Keep in mind that a 7/16 -20 in a 3 9/16" length is not a "standard length". it usually goes 3 1/2" then 3 3/4". It's the grip length ( the unthreaded part of the bolt) that is important. I suppose a few washers under the head could resolve that with the 3 3/4" bolts..... Has anyone bought the B7A-5630-C kit? If so, can we get bolt measurement? If any one has a connection with one of the suppliers maybe they can get an accurate measurement for us, the unthreaded portion as well as the overall.
          The picture I see on the websites sure look like a course threaded bolt (7/16-14) but it's only a picture so..........
          Image1.jpg
          Last edited by frank58; January 11th, 2021, 09:19 AM.

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          • #6
            I concur. Every leaf spring bolt I ever used was fine thread. Does it matter? Bear in mind, the spring's front bushing's inner sleeve should NOT pivot on the bolt. Let me say it another way... The bolt tightens the inner sleeve against the frame bracket. Many bushing inner sleeves have teeth or serrations on the ends so the only part that moves is the urethane.

            Rear shackle bolts and bushings operate differently. They use bushing halves inserted on each side. Those bushings do pivot on the bolt.

            If you want real professional spring advice or service, I use: http://www.johnrspring.com/ - Dave
            My latest project:
            CLICK HERE to see my custom hydraulic roller 390 FE build.

            "We've got to pause and ask ourselves: How much clean air do we need?"
            --Lee Iacocca

            From: Royal Oak, Michigan

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            • #7
              Originally posted by simplyconnected View Post
              I concur. Every leaf spring bolt I ever used was fine thread. Does it matter? Bear in mind, the spring's front bushing's inner sleeve should NOT pivot on the bolt. Let me say it another way... The bolt tightens the inner sleeve against the frame bracket. Many bushing inner sleeves have teeth or serrations on the ends so the only part that moves is the urethane.

              Rear shackle bolts and bushings operate differently. They use bushing halves inserted on each side. Those bushings do pivot on the bolt.

              If you want real professional spring advice or service, I use: http://www.johnrspring.com/ - Dave
              When did Ford switch to course threads for leaf spring shackles (or was it only trucks)? None of my 78/79 trucks and broncos had fine
              thread shackle bolts, and I've had over 30 of those trucks (including parts rigs) in the past 25 years.
              59-430-HT

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