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Shackle moves sideways alot. How much PSI in bump stop

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Alan2smiley, Jul 2, 2017.

  1. Alan2smiley

    Alan2smiley I'm in the shop Premium Member

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    88 GMC CC On a rough paved road. Is this normal? 52" ORD springs with poly bushing with about 3500 miles on them.
     
  2. Alan2smiley

    Alan2smiley I'm in the shop Premium Member

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    Mounted a camera today.

    20170702_110422.jpg
     
  3. Fastereddie

    Fastereddie Sorry if I offended you. Not. Premium Member

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    Id say looks as I would expect. Especially with a big 'ol heavy cummins above it. Guess you'll just have to link and coil over it. :woot:

    Super jelly of your bumpstops btw.
     
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  4. nvrenuf

    nvrenuf NONE shall pass! Premium Member

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    I agree, it looked like I expected. Maybe install a (restrictive) panhard bar?
     
  5. blazinzuk

    blazinzuk Buzzbox voodoo Premium Member GMOTM Winner

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    I'd say normal
     
  6. Blazooki

    Blazooki five-0 Premium Member

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  7. Alan2smiley

    Alan2smiley I'm in the shop Premium Member

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    When I started the build links were kinda unheard of and kits we're not available. If I had to do it again I would definitely link it. I haven't hit any hard bumps yet and the stops bottom out pretty easy with 40 PSI. Its a 700lb 4BT, I was going to try 80 PSI. sound about right?
     
  8. Alan2smiley

    Alan2smiley I'm in the shop Premium Member

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    Yes I have the DIY upper kit, poly slide-spacers between shackle and frame are probably unheard of ?
     
  9. jekquistk5

    jekquistk5 Weld nekid Premium Member GMOTM Winner

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    Most the go fast guys run about 150... Usually people start at 200 and work their way down.
     
  10. Alan2smiley

    Alan2smiley I'm in the shop Premium Member

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    I can only try to go fast and since it's little heavier I start with 200psi. Thanks
     
  11. diesel4me

    diesel4me 1 ton status Premium Member

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    It does seem to flex side to side quite a bit--but who knows if that's "normal",it is only recently we have the ability to watch & record things like this...
    If the shackles are longer than stock they will flex more-I am kind of surprised they are not "H" shaped with a tie bar across both plates,that would help keep them from flexing as easily..
     
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  12. Alan2smiley

    Alan2smiley I'm in the shop Premium Member

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    Hydro assist would probably inpove it some.
     
  13. Chevy305

    Chevy305 6 Lug 14bsf Status Premium Member GMOTM Winner

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    Does it handle weird at all? Wandering and such?

    P.S. Love the sound of that 4bt :bow:
     
  14. Blazooki

    Blazooki five-0 Premium Member

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    you can't H the front shackles cause the shackle moves so far up along the frame when the spring flexes that any tie bar would hit the bottom of the frame way before the spring was compressed. You can however get H shackles for the rear and they work very well. longer shackles also get into the front body mount. (you can see how Alans already had to cut his a bit)

    I had "L" shaped shackles on my old school front with 52s. That let the shackle go around the body mount when it compressed. If you made a set of "L" shaped shackles then you could cross brace the front portion of the L...I did a CAD drawing to help explain.

    Inked20170702_110422_LI.jpg
     
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  15. Alan2smiley

    Alan2smiley I'm in the shop Premium Member

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    Now that I have seen the video it's little sloppy. :screwy: I have a idea that should help, will post pictures when it's done.
     
  16. Alan2smiley

    Alan2smiley I'm in the shop Premium Member

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    Springs are flat so they shouldn't travel back anymore.

    20170715_175553.jpg

    20170715_195016.jpg

    20170716_070607.jpg
     
  17. Fastereddie

    Fastereddie Sorry if I offended you. Not. Premium Member

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    Test drive yet?
     
  18. Alan2smiley

    Alan2smiley I'm in the shop Premium Member

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    Yeah it's better but room for inprovement. I think hydro assist and maybe solid bushings on top it should drive like a Maserati. :haha: Can see were the bolt was hitting the shackle.

    20170716_070241.jpg

    20170716_073557.jpg
     
  19. Fastereddie

    Fastereddie Sorry if I offended you. Not. Premium Member

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    I'm afraid to video what my supension is doing....
     
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