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Gas VS diesel front 4x4 leaf springs

Discussion in 'General, Performance, Upgrades & Accessories' started by Lonesome7.3, Jul 10, 2016.

  1. Lonesome7.3

    Lonesome7.3 CSA

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    Is there a difference between the front leaf springs on a 99 and up Super Duty? And is there a difference between the 99 and up F 350 and 250 front spring packs? I need a set for a 99 F350 but they are under a gas engine and I do not know if it is a 2 or 350.
     
  2. Double-S-Diesel

    Double-S-Diesel parts seller

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    it alll depends on the spring code and if it was a plow package
    for the leveling everyone wanted x code springs
    on my 03 I used a set from a reg cab v-8 gasser, they sat level with rear even with the diesel motor
    when we redid the 00 from being lifted I had a set from a v-8 gasser they had way too much sag and I added a leaf to them
    short answer it depends on the code and between 250 and 350 they are all 2 leaves
     
  3. Lonesome7.3

    Lonesome7.3 CSA

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    Thanks, that helps a lot. Where do I find the spring code?
     
  4. Double-S-Diesel

    Double-S-Diesel parts seller

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    if you have the donor vehicle it is on the sticker

    This is what I have collected on Ford's front leaf spring codes:
    S codes = 4000lbs capacity, 370 inch/lbs, 4.34" travel.
    B codes = 4100lbs capacity, 330 inch/lbs, 5.02" travel.
    C codes = 4300lbs capacity, 350 inch/lbs, 5.01" travel.
    T codes = 4400lbs capacity, 390 inch/lbs, 4.63" travel.
    D codes = 4700lbs capacity, 380 inch/lbs, 5.14" travel.
    U codes = 4800lbs capacity, 410 inch/lbs, 4.89" travel.
    V codes = 5200lbs capacity, 430 inch/lbs, 5.13" travel.
    W codes = 5600lbs capacity, 450 inch/lbs, 5.34" travel.
    X codes = 6000lbs capacity, 470 inch/lbs, 5.54" travel.
    Capacity is per set.
    __________________
    if ya have loose springs the part # is stamped on them
    o R - F81A-5310-AAB, 3,600 lb.
    o 7 - Six-speed manual, Dana ZF (M6HD-W),
    o S - F81A-5310-AAB, 4,000 lb. F-Series (diesel)
    o T - F81A-5310-ABB, 4,400 lb.
    o U - F81A-5310-ACB, 4,800 lb.
    o V - F81A-5310-ADB, 5,200 lb.
    o W - F81A-5310-AEA, 5,600 lb.
    o X - F81A-5310-AFA, 6,000 lb.
    o Y - F81A-5310-VA

    S = 2C34-5310-AAB, 4,000 lb.
    T = 2C34-5310-ABB, 4,400 lb.
    U = 2C34-5310-ACB, 4,800 lb.
    V = 2C34-5310-ADB, 5,200 lb.
    W = 2C34-5310-AEA, 5,600 lb.
    X = 2C34-5310-AFA, 6,000 lb.
    just some of the #s I found quickly
     
  5. Lonesome7.3

    Lonesome7.3 CSA

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    Holly crap that is helpful. Thanks!
     
  6. Ethan Smith

    Ethan Smith Full Access Member

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    My spring codes 9 K. Any clue what that means?
     

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