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Front shackles need to be moved?

Discussion in 'The Garage' started by Frogg89, Sep 1, 2002.

  1. Frogg89

    Frogg89 Registered Member

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    Im lifting my truck 6 inches with springs. I got them off a 78. I noticed they(the springs) are short from the originals "The truck Im lifting now is an 89". Ill have to change the angle of the front shackles to get the fit, Is this OK???
     
  2. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Arched lift springs lengthen when they compress, unlike the stock flat springs which pull in for both compression and extension. Therefore, the static height eye-to-eye measurement is shorter for lift springs (the spring eye end of the shackle is forward of the frame mount) so that they do not lengthen and HIT the frame.

    In order to deal with this there are a couple of common solutions.

    1) Ignore it and just hook it up. It still works mostly ok but limits axle movement and articulation.

    2) Get springs with more lift than you need and remove a leaf or two. This causes them to sag a bit and results in a better shackle angle plus softer rates. However, you will need longer shackles to prevent hitting the frame and this will affect your caster. Note that this may affect spring life and warranty. Same effect can be achieved by experimenting with hybrid spring packs (as Donovan had great success with) or ordering custom spring packs. I believe Stephen Watson of ORD has a very nice spec for custom springs that solve this problem. Greg72 has a pair IIRC.

    3) Relocate the upper shackle mount forward and add longer shackles as in 2 above. This will effectively reduce spring rate and allow much more movement. It will also not void your warranty. However, it is much more work and you should make sure you know what your doing before starting modifications to critical suspension and steering components.

    I’m currently planning on implementing #3.
     
  3. m j

    m j 1/2 ton status

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    #4 replace the main leaf with a custom longer one and still go for the longer shackles

    #3 ? doesnt that put the shackle hanger way up the frame rise? really long shackles required(not a bad thing IMO.
     
  4. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    I kinda lumped your #4 into my #2. /forums/images/icons/laugh.gif

    Yes, it moves up a little, but, if you put the casting right down on the lip of the frame channel (rotating it just a little from the stock orientation), it's not that much. I estimate that my shackles will be no more than 7" long to get what I want.
     
  5. m j

    m j 1/2 ton status

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    you should check out the ford and dodge hangers
    I think the ford is 3 bolt and you may get it even closer to the bottom of the rail
     
  6. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Good idea, hadn't even considered that. I'll look next J/Y trip...
     

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