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52/56s on first gen?

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by MNorby, Aug 20, 2006.

  1. MNorby

    MNorby 3/4 ton status Premium Member GMOTM Winner

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    I just piicked up a 71 k5 for $150. Gonna budget build a weekend warrior rig. I have all kinds of extra sets of 52s and 56s I have scored for the truggy. Anyone running these springs on the 1st gens? I never really read about them on these years. Thanks for the indo, can't wait to start building this new rig
     
  2. bigblock72

    bigblock72 1/2 ton status Premium Member GMOTM Winner

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    56's are the only way to go on a first gen IMO when doing a shackle flip. They put the axle slightly back from the original position (52's you have to slide the axle back 1 1/2 with a shackle flip) they are fairly easy to get new or used and don't seem to sag as bad with hard use as a 52. I used a set from a burb with a 2" add a leaf with my homemade frame brackets and ended up with about 5-6 inches of lift, enough to clear 37s without trimming the wheel openings. 64's are too long to use without some serious mods.
    Order some shackles and brackets from ORD or get the torch and welder out and get building.
     
  3. 1967k10

    1967k10 1/2 ton status

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    I assume you are talking 52"s or 56"s on the front? I'm trying to get DIY4X to build some but I don't think he has gotten a frame to build off of yet.
     
  4. bigblock72

    bigblock72 1/2 ton status Premium Member GMOTM Winner

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    I didn't even consider you could be talking front springs. 52's on the front seems very doable (i've never done it myself though). Just follow the directions on this site and it should work well.
     
  5. GotLabs

    GotLabs 1/2 ton status GMOTM Winner

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    Any certain years trucks to look for? Stock 56's and shackle flip = 4"?
     
  6. bigblock72

    bigblock72 1/2 ton status Premium Member GMOTM Winner

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    I personally prefer the 1/2 ton trucks and burbs because they have a fairly moderate sized spring pack with friction pads on the end of the leafs, but any 56" spring will work you just may have to adjust the amount of leaves to suit your needs. Stock 56" springs and shackle flip is usually closer to 3", it varies on the weight of your rig and the condition of the donor springs, worst case just throw in an add a leaf you're there. When you put it together make sure your u-bolts are long and don't cut them until you go on a test drive and get the springs to settle in.
     
  7. GotLabs

    GotLabs 1/2 ton status GMOTM Winner

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    Thanks for the info, I have pondered this idea for a while now. Just couldnt find any info on here about it, until now.
     
  8. MNorby

    MNorby 3/4 ton status Premium Member GMOTM Winner

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    yeah, I have 52 in the front and 56s in the rear of my 83 truggy and i have like 2 extra sets of each. I also have a lift for a 1st gen front springs, they are 2 leaves and look like the arch of a 4". I may just use that top leaf and put half a set of 52 pack under it too. For the rear I will build my own shakle flip like this one i found and prob go 56s.

    MVC-001S.JPG
     
  9. RGV72BLAZER

    RGV72BLAZER 1/2 ton status

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    i'll be running 52/63s on mine shackle flip in the rear *i may go with a shorter shackle in the rear, not sure how the 6.0 ORD shackle will work* and will be running a 7" shackle with the 52s. i know LucasJ03 is running 52/63s on his '72 K5.
     
  10. MNorby

    MNorby 3/4 ton status Premium Member GMOTM Winner

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    I started mocking up the 56s in the rear tonight to figure where to build my rear shakle hanger. Will hopefully finish this weekend.
     
  11. MNorby

    MNorby 3/4 ton status Premium Member GMOTM Winner

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    well got my rear shackle flip built with 56s and some 4" springs on the front now. The rear sites 2.5" taller than front. I will take the overload out of the rear pack to drop it roughly 3/4 inch then a zero rate in the front to move the front axle forward an inch or so and give it an inch of lift then it will be ~1" taller in rear w/o a top on. The shackle flip pic is with no rear end and springs unloaded. I forgot my camera at shop with the pic of the shackle angle with the springs loaded

    71k590406.jpg

    shackleflip.jpg
     
  12. RGV72BLAZER

    RGV72BLAZER 1/2 ton status

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    lookin' good. what size tires are you planning to run?
     
  13. MNorby

    MNorby 3/4 ton status Premium Member GMOTM Winner

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    35s or 36s probably
     
  14. MNorby

    MNorby 3/4 ton status Premium Member GMOTM Winner

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    better pics

    DSC03464.JPG

    DSC03436.JPG
     
  15. Moody

    Moody 1/2 ton status

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    I've got a couple of questions if you don't mind....I'm in the process of doing the same thing with my 70. With the shackle flip and 56's did you use a stock 56 inch spring? I would like to get 6 inches in the back using 56's and five inches in the front using a four inch spring and a zero rate. With a stock 56 and shackle flip about how much lift did you get?
     
  16. MNorby

    MNorby 3/4 ton status Premium Member GMOTM Winner

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    i didn't measure the rear but before I lifted it was level. The front gave me exactly 4" lift and with the 6 leaf+overlad pack of 56s it is 2.5" taller in the rear than front. I dropped the overload to drop the rear some and I took the zero rates out of my buggy today to put in the front but haven't yet. Sounds like the same setup you plan on
     

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