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Difference between under axle and over axle leaf springs?

Discussion in '5 Lug' started by Scrider424, Dec 21, 2011.

  1. Dec 21, 2011 at 7:47 PM
    #1
    Scrider424

    Scrider424 [OP] Well-Known Member

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    Sorry if this seems newbish but I was wondering what are the main differences between our 5 lug under axle leafs and the prerunner over axle springs? Is it performance or just for a higher ride?
     
  2. Dec 21, 2011 at 7:56 PM
    #2
    Phuket

    Phuket Well-Known Member

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    lower ride height, honestly not sure.... although a lot of LT guys like the SUA
     
  3. Dec 21, 2011 at 7:59 PM
    #3
    whippersnapper02

    whippersnapper02 Well-Known Member

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    No difference in the springs themselves. Maybe different rates.
     
  4. Dec 21, 2011 at 9:01 PM
    #4
    afd23a

    afd23a Well-Known Member

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    under axle gives less axle wrap
     
  5. Dec 21, 2011 at 9:43 PM
    #5
    Kelson

    Kelson My Truck is Cuter than Yours

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    no. They all have different rates, and the design of the leaf pack themselves are different. 5 lug base and XR are similar, as well as the 6 lug packs, but they differ from each other.

    2nd Gen Trucks come with one of four leaf packs.

    1. 5 Lug 3 leaf pack (greatest arch)
    2. 5 Lug 3 leaf pack (XR Models, De-arched, less capacity, stiffer, less progressive)
    3.6 Lug 3 leaf pack (different design than the 5 lug packs, the 2nd leaf extends almost around the front leaf hanger, unhappy overload vs. happy for 5 lug springs)
    4. 6 Lug 4 leaf pack TSB& Canadian


    6 lug and 5 lug leaf packs do however use the same mounting points so in theory they are interchangeable. 6 lug leaf packs do have less of an arch, so if you use them in a SUA setup on your 5 lug, they will drop the truck. I have this setup.

    6 lug leafs are a bit more progressive than the 5 lug leafs, and are stiffer. Speaking from experience.

    6 lug leafs on the left, 5 lug leaf on the right. the side facing you in the front of the leaf relative to the truck. notice the difference in the 2nd leaf.
    [​IMG]
     
  6. Dec 21, 2011 at 9:45 PM
    #6
    whippersnapper02

    whippersnapper02 Well-Known Member

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    :thumbsup:
     
  7. Dec 22, 2011 at 8:34 AM
    #7
    Scrider424

    Scrider424 [OP] Well-Known Member

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    Thank you for all the replies. That makes a little more sense now. As far as the under axles having less axle wrap... What exactly does that mean? I've heard it said a million times but am unsure of what it actually is. Also if it causes less axle wrap why didn't the prerunner go with under axle?
     
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