Leaf Spring Sliders Install - Experienced Advice Please

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  1. #41

    #41 Well-Known Member

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    Hi guys - I am installing a set of AFCO sliders and note that the full travel length is 4-inches. That appears to be the same length that my leaf spring will extend from unloaded to fully flat. I'm concerned about being able to install and remove the spring and still have full travel without binding when the spring is fully loaded and flat.

    Right now I plan on locating them with the springs unloaded, connected to the front hangers, and with the pin in the slider all the way forward. This should work, but still leaves no room for error. The slider has 4 inches of travel and the springs will be 4 inches longer when loaded flat.

    Am I missing something or concerned about nothing? Experienced install tips please!

    Here they are: https://www.summitracing.com/parts/afc-20236s
     
  2. Jeremiah

    Jeremiah FBBO Gold Member FBBO Gold Member

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    I think you will be fine as long as you don't hit the RR tracks at 90mph.

    You want to keep the spring oriented so it is somewhat level front to rear.
     
  3. malex

    malex FBBO Gold Member FBBO Gold Member

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    With the springs unloaded you’ll want to still leave some forward travel. My sliders came from Speedway and the slot allows 4.5” travel. I left 1” space at the front when the springs are unloaded, diff hanging. At launch you want to make sure you don't run out of travel during rise. When sitting level on ground I have lots of slot remaining at the rear. I’d suggest to mock them up and check loaded and unloaded.

    E24D8068-4A39-45BB-8A9E-EB570EC41FD6.jpeg
     
    Last edited: Dec 3, 2020
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    • Jeremiah

      Jeremiah FBBO Gold Member FBBO Gold Member

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      And note the pic above has the slider on the chassis (lowers the ride height) *and* the front spring eye is in the top hole. This is a good thing. I had to do the same on my 66 Charger to correct the pinion angle I am remembering right. That it looks bad ass : D
       
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      • malex

        malex FBBO Gold Member FBBO Gold Member

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        A couple more pictures.

        Slider position at ride height.
        C6C348A8-FA95-452D-A494-62546E060B47.jpeg


        This is why it’s good to have additional travel at the front of the slider when the leaf is unloaded. When you have extreme separation those leafs curl up pretty good and that extra travel will get used up.
        CBDF1A4E-68C3-41AA-BE00-37A7E103411B.jpeg
         
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        • #41

          #41 Well-Known Member

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          Really appreciate this input Malex. Those pics were worth a thousand words. Have it mostly mocked up now and I'm on the right path.
           
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          • dvw

            dvw Well-Known Member

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            I agree the spring will move further forward and less rearward than you would think.
            Doug
             
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            • rumblefish360

              rumblefish360 Well-Known Member

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              I’ve seen some good go pro footage of there movement. See if you can find some footage on you tube.
               
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              • NSS Guy

                NSS Guy Well-Known Member

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                • rumblefish360

                  rumblefish360 Well-Known Member

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                  Great use of a go pro. Excellent!
                   
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                  • malex

                    malex FBBO Gold Member FBBO Gold Member

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                    —-
                    That shows exactly what’s going on. IMO I’d say those sliders could be installed a little further ahead still but they sure do the job.
                     
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                    • NSS Guy

                      NSS Guy Well-Known Member

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                      The video was first time with Viking shocks, I tightened up the extension after that run and was good after that. That pass was 1.47 60ft and 10.48 et at NMCA Indy 2019
                       
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                      • malex

                        malex FBBO Gold Member FBBO Gold Member

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                        Yes NSS some shock adjustment would take care of that. I’m sure it was fine anyways, just the camera angle. A perfect video for the guy doing his install. Good old FBBO guys always quick to lend a hand.
                         
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                        • biomedtechguy

                          biomedtechguy Accelerati Rapidus Maximus FBBO Gold Member

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                          That video, before I knew it was you, convinced me just from watching how sliders work, to make a pair of the Calvert brand part of my substantial suspension upgrades.
                          My 70 Roadrunner is 80% or more street use for now.
                          The crossbolt is about 1/3rd of the total space back from one end (I don't remember which end)
                           
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                          • #41

                            #41 Well-Known Member

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                            The way my install ended up is with the sliders about 1/2" from the back end with the springs fully loaded (flat arch). Unloaded they are about 1/3 of the slot from the front.

                            My measurement of total spring length at max (flat arch) turned out to be about an inch off, so my original concerns about the slot in the slider not being long enough was unfounded. I'm confident that I have this set up just right, thanks to all your input.

                            :luvplace:
                             
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                            • malex

                              malex FBBO Gold Member FBBO Gold Member

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                              You got it right. The sliders will work well for you. HNY!
                               
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