Author Topic: Pro Comp leaf springs, lifts, and lengths  (Read 1946 times)

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Offline Mad Max

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Pro Comp leaf springs, lifts, and lengths
« on: June 27, 2018, 09:07:30 am »
Hey gang - figured this might help when trying to plan out suspension ideas etc.

This is a basic list of Pro Comp Chevy leaf springs with the lifts and lengths.  I use this a lot planning out projects and trying to determine what leafs will fit and function best - have used this list for many projects in the past and now.  I am not 100% certain, but as best I can determine all of the leafs below come with rubber bushings for 1/2" bolts, and military straps (to keep the leafs 'aligned').

- Sam

48" leaf spring

 - 11211 (2.5")
 - 11411 (4")
 - 11511 (6")         

52" leaf spring

  - 13311 (4")
  - 13411 (6")

56" leaf spring

  - 13511 (4")
  - 13611 (6")

63" leaf spring

  - 13211 (3.5")
  - 13711 (5.5")
« Last Edit: June 27, 2018, 09:09:23 am by Mad Max »
2002 Dakota Quad Cab 4x4 - 440/46rh/Atlas4/D60/14b/40s
2007 Cummins Ram 3500 Megadually 4x4 "Big Mack" - 5.9/G56 6-speed
2016 Durango Citadel AWD - 5.7 Hemi/8-spd auto
1952 Willys M-38 "Poncho"

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    Offline Elwenil

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    Re: Pro Comp leaf springs, lifts, and lengths
    « Reply #1 on: June 27, 2018, 09:46:05 am »
    FYI, the clamps that go around the leaf pack to keep the leaves aligned should be on all leaf springs.  They keep the pack tight and add to stability as it reduces lift and droop.  They can be cut out to gain more droop in an off road vehicle at the cost of more body roll and some pretty hairy high speed turns as the rear will tend to suddenly lift in a fast, sharp turn.  This is due to the main leaf being the only one to resist the lift, where with all the clamps on, most of the leafs are together resisting the lift.  Cutting the clamps off can also lead to fatigue of the main leaf and eventual breakage, usually right at the spring plate.

    A military wrap is where the 2nd leaf (and sometimes even the 3rd) is as long as the 1st and will loop loosely around the spring eye.

    TOP is a leaf spring eye with military wrap, BOTTOM is a typical "normal" leaf spring eye:



    Note the clamps on both leaf springs, the top one allows some separation of the pack for added droop but still supports the main leaf, the bottom is a more common stock type clamp that is riveted and insulated.  Most heavy duty springs use the upper style clamp.  Many stock clamps are not riveted and the insulation has long since been destroyed allowing the clamp to slide.  My '74 W200 has the upper style riveted clamps while my '88 Ramcharger just has sheetmetal clamps folded around the spring that have now come loose are a sliding all up and down the springs.
    L.Clemons

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    Offline Mad Max

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    Re: Pro Comp leaf springs, lifts, and lengths
    « Reply #2 on: June 27, 2018, 09:53:50 am »



    Note the clamps on both leaf springs, the top one allows some separation of the pack for added droop but still supports the main leaf, the bottom is a more common stock type clamp that is riveted and insulated.



    good point - thanks Lanty.  Yes I was referring to the 'HD' version of the keeper straps in the top pic that keep the packs aligned - not that there was a secondary main leaf (...I wish...).
    2002 Dakota Quad Cab 4x4 - 440/46rh/Atlas4/D60/14b/40s
    2007 Cummins Ram 3500 Megadually 4x4 "Big Mack" - 5.9/G56 6-speed
    2016 Durango Citadel AWD - 5.7 Hemi/8-spd auto
    1952 Willys M-38 "Poncho"

                    .there's always a way...

                           ...Molon Labe...

    Offline Elwenil

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    Re: Pro Comp leaf springs, lifts, and lengths
    « Reply #3 on: June 27, 2018, 10:28:42 am »
    Yeah, you usually have to go with custom springs to get the military wrap unless the vehicle came with it originally.  For some vehicles the military wrap won't work without some modification.  Our trucks for example, there usually isn't enough clearance in the front spring front mounts for a full wrap.  Of course if you can afford custom springs, you can probably afford to make a new bracket.  ;D
    L.Clemons

    1988 Ramcharger AW450-318EFI-NP435 4 speed-NP205 Transfer Case-Dana 60s-Braden Wormdrive Front Winch

    2018 Ram 2500HD Crew Cab 4WD 5.7L

    I am the unknown Will,
    The Anger that threatens glory and ruin:
    Lord of Storms am I,
    in heaven high and caverns deep.
    I am the Father of the War,
    Odin for you, Wotan for him,
    Wayfarer, Wanderer, beggar, king,
    numen, genius, strength and ring.