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Frame Thickness

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by dmanblazer, Feb 17, 2007.

  1. dmanblazer

    dmanblazer 1/2 ton status

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    Is there a difference in thickness of frames from '79 to '82
     
  2. imiceman44

    imiceman44 1 ton status

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    I think they went with better metals because they went thinner on later years.
     
  3. roadnotca

    roadnotca 3/4 ton status

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    Are you talking about different thickness between K5,C/K10 vs. C/K20 & 30?
     
  4. imiceman44

    imiceman44 1 ton status

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    No.
    Difference between years o production for the same weight class.
     
  5. roadnotca

    roadnotca 3/4 ton status

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    :doah: Maybe the better question is how many different thicknesses are there and what are they?:D
     
  6. dmanblazer

    dmanblazer 1/2 ton status

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    I have a '79 K5 and just found a '82 for $700 I would like to use my engine, rear end and transfer case (NP 205), but if there is a difference in frame thickness I'll just swap bodies. My '79 is all ate out with rust the only thing that isn't are my doors and floors, the "82 is in nice shape.

    The reason I'm concerned about it is my buddy had an '86 C1500 and I had an '80 and he kept tearing the frame around the suspension and I didn't, I compared the two and mine was thicker, and everybody keeps talking about ripping the steering box off the frame on their K5's and mine hasn't yet so now I have to know.
     
  7. imiceman44

    imiceman44 1 ton status

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    The later models are thinner, but not weaker.
    Some frames break faster than others because when they stamp the frames, some times they have scratches from the process and that creates stress cracks if it's worked hard, some frames come out cleaner and they last a long time without cracking, although a long time will not mean never, if yours is in good shape brace it so it doesn't crack.
    Now for your original question, use the cleaner truck of the 2 you have, don't think about the frame only but about the truck that needs less work or looks better, since the frame is not cracked yet, it's easy to make sure it doesn't by bracing it now with a bolt on brace.
    If you are handy with metal you don;'t need to buy one, you can make one, it's not that hard.
    :D
     
  8. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    A search might turn it up, but we had a thread going a few years back where a bunch of us mic'd our frames. Consensus was they didn't change the thickness over the years...and the average thickness was 0.151". IIRC the variation in what we all measured was only about 5 thou.

    Rene
     
  9. roadnotca

    roadnotca 3/4 ton status

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    And that's the thickness of the "plates" in the frame reinforcement kit from ORD.:D
     
  10. dmanblazer

    dmanblazer 1/2 ton status

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    Maybe one of these days I can set my K5 up right.
    Does anyone know if 38 x bigger than 12.50 x 15 or 16.5 will fit on a K5 with a 4" sups. lift and a 3" body lift, without having to cut the fenders or adding zero rates?
     
  11. dmanblazer

    dmanblazer 1/2 ton status

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    ttt!
     
  12. imiceman44

    imiceman44 1 ton status

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    with the added 3" body lift you most probably can fit them.
     

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