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Help Me Help You With Spring Measurements!

Discussion in 'The Garage' started by BorregoK5, Aug 12, 2002.

  1. BorregoK5

    BorregoK5 1/2 ton status

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    I get a lot of questions concerning ride height after a shackle flip but invariably it is a result of the condition of the the stock rear leaf springs. I'm curious of the range of lifts people are getting on their stock rear suspension and I'm sure many of you would like to know how much or little your rear end is sagging (especially those of you with blocks). So, heres a good test for everyone.

    Park your truck on flat ground and measure the distances from the center of the spring eye bolts to the ground as well as the bottom of the leaf pack to the ground. You might take sepperate measurments off each side to cross compare as well. Last, include a little about the state of the truck at the time of the measurement, things that would effect weight.

    Example (of my ford 57" springs)
    Right Side Front Eye To Ground: 23.5"
    Right Side Bottom Of The Leaf Pack (Or Top Of Blocks) To Ground: 22.5"
    Right Side Rear Eye To Ground: 22"
    Scenario: No Top, No Spare, half tank gas, light bumper

    By adding the eye measurements together, dividing by 2 to get an average then subtracting the center measurement you will get a number everyone can compare to which is the arch.

    Example: (23.5 + 22) / 2 = 22.75
    22.75 - 22.5 = .25 or 1/4" loaded arch.

    For those people wishing to do spring swaps or other spring related modifications, these measurements can really help. Post what you get and lets see how much variance the stock springs reveal with each persons setup.
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    You can always run a string line from one spring eye bolt to the other and measure down to the spring pack in the center...that rids you of one variable, the ground./forums/images/icons/smile.gif

    Using a string line I got 2.25" of loaded arch on both sides. No hardtop, half tank of fuel, 57" Ford springs, shackle 1.5" longer than stock but at a fairly aggressive angle./forums/images/icons/smile.gif

    Rene
     
  3. BorregoK5

    BorregoK5 1/2 ton status

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    Do you still have your stock spring measurements from before the 57" swap?
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I...uhhh...*cough*...uhhhh...musta thrown that paper out/forums/images/icons/blush.gif

    Sorry Mike!
     
  5. BorregoK5

    BorregoK5 1/2 ton status

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    I think I saved it, but not sure.. your 57"s are?

    rear eye center = 24
    top of pack under spring plate = 22
    front eye center = 27.5
    Thats 3.75" of loaded arch, 10" free arch, 6.25" of weighted travel and they weren't quite resting against the overload yet (not flipped).

    Found your stock pm...yours were:

    Front eye...24"
    Rear eye...32"
    Center of pack...24.5"
    thats 3.5" of loaded arch with stock springs.

    Empty fuel tank no topper and no junk in it, not even a spare tire.
     
  6. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Sounds right...I have less loaded arch now but a longer shackle.

    Rene
     
  7. BorregoK5

    BorregoK5 1/2 ton status

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    I'm curious as to how many people will come up with 3.5" of stock loaded arch and how much variance we'll see accross years, models and different set-ups
     
  8. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Well my old springs weren't sagged...the truck sat level with the tire carrier and hard top on it. The 3.5" of loaded arch was without the hardtop on though.

    rene
     

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