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56" long rear springs

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by CK5, Nov 21, 2001.

  1. CK5

    CK5 In my underwear Administrator Premium Member GMOTM Winner Author

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    56\" long rear springs

    OK, what's the deal on 56" long springs, what years did they come on and what year did they have the teflon pads? I thought that 73-87 1/2 ton had the 56" but was it just 3/4 and 1 ton? Someone give me the scoop please.

    Steve

    Director of Global Expansion
     
  2. txbartman

    txbartman 1/2 ton status

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    Re: 56\" long rear springs

    I believe it is just the 3/4 ton +. I have an 85 1/2 ton and I KNOW that it is 52".

    Brian
    Check out <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Jimmy</a> with all her projects!
     
  3. CK5

    CK5 In my underwear Administrator Premium Member GMOTM Winner Author

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    Re: 56\" long rear springs

    OK, what about the 88 (IFS) and up 1/2 ton, did they have 56"?

    Steve

    Director of Global Expansion
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Re: 56\" long rear springs

    Those were 63" I think..

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
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  5. CK5

    CK5 In my underwear Administrator Premium Member GMOTM Winner Author

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    Re: 56\" long rear springs

    So if I want 56" long springs, I have to look for 73-87 3/4 ton only?
    Are Ford F-150 1/2 ton springs 56" long, are they the same width as GM?

    Steve

    Director of Global Expansion
     
  6. Boss

    Boss 1/2 ton status Author

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    Re: 56\" long rear springs

    I remember Marv Springer telling me that the Fords are 57" long and they're a lot softer (flexier) then our stock blazer ones. that's what he uses with his setup.
    Boss

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  7. CK5

    CK5 In my underwear Administrator Premium Member GMOTM Winner Author

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    Re: 56\" long rear springs

    How wide are the Ford springs and are the 57" from an F-150 or F-250?

    Steve

    Director of Global Expansion
     
  8. big75jimmy

    big75jimmy Registered Member

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    Re: 56\" long rear springs

    Some '73 to '87 half-ton pickups that came with the "heavy-half" option had 56" rear springs,but I have only seen two-wheel drive trucks with this option.
     
  9. marv_springer

    marv_springer 1/2 ton status

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    Re: 56\" long rear springs

    The 56" long springs were only on "some" 3/4 tons.... How you tell without getting under there and measuring - I don't know.

    I use "86 to 96" F-150 springs and they are 57" long. Be careful as they come in both 2.5" and 3" widths. I use only the 2.5 inchers. Also, the center bolt is not in the center, and it measures 25" from the front eye to center bolt, and 32" from center bolt to rear eye. I modify them by redrilling to get 26" from front eye to center bolt - which matches the front half of the stock 52" spring.

    Marv
     
  10. CK5

    CK5 In my underwear Administrator Premium Member GMOTM Winner Author

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    Re: 56\" long rear springs

    Thanks Marv, do you know if the 57" Fords would sit at the same ride height as GM 52"?

    Steve

    Director of Global Expansion
     
  11. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Re: 56\" long rear springs

    Steve, I know the 56" rear springs were available from '80 up to '91 on Suburbans, both in 1/2 and 3/4 ton version.


    I'm not picking my nose...I'm just pointing at my brain!! [​IMG]

    <a target="_blank" href=http://coloradok5.com/gallery/thatK30guy>The K30 Collection</a>
     
  12. marv_springer

    marv_springer 1/2 ton status

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    Re: 56\" long rear springs

    It would be real close..... I can usually build the springs to have 4-6" of lift over stock with my shackle flip. So, I'm sure it would be right in the ballpark there...

    I should caution you that the F-150 springs are way softer than your stockers. I recommend against towing with my system for this reason. After Frizzlefry bolted on my system, he commented that his truck "rode like a car"...! Way flexier - but you trade much of your load carrying and towing capacity.

    I have several sets of these springs lying around. If you have any more q's, fire away!

    Marv
     
  13. Liberator

    Liberator 1/2 ton status

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    Re: 56\" long rear springs *DELETED*

    Post deleted by Liberator
     
  14. dyeager535

    dyeager535 1 ton status Premium Member

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    Re: 56\" long rear springs

    When searching for springs for my K5, I found the longer ones too, but they were always on 2wd trucks. So was it just coincidence that the 2wd ones I had looked at were all 3/4 or 1 tons, or did 2wd's ALL get long springs, and 4wd, at least half tons, got short ones?

    Dorian
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  15. 502Burban

    502Burban 1/2 ton status

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    Re: 56\" long rear springs

    FWIW, Wes is correct. The key word being "available". Not all 3/4 tons came with them and unfortunately my Suburban is an example. '73 3/4-ton with 52" rear springs. [​IMG] However, the research I've done tells me that _most_ 3/4 ton vehicles come with them.

    Robb
    '73 GMC Suburban - 502DFI
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  16. marv_springer

    marv_springer 1/2 ton status

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    Re: 56\" long rear springs

    Liberator,

    I assume you already have 56" springs? If your shackle angle is anywhere close to vertical, I would think that the extra 1" of length wouldn't be of concern.... but you'd have to try and see.

    Still, there is prolly a difference in the front eye to center pin distance, no? What do the 56" springs measure for this?

    Marv
     
  17. CK5

    CK5 In my underwear Administrator Premium Member GMOTM Winner Author

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    Re: 56\" long rear springs

    Marv
    Does it matter if the F-150 springs are from a 4x4 or 2wd? How much do you want for a pair? Might be cheaper if I got them locally though, that whole shipping thing.

    Steve

    Director of Global Expansion
     
  18. marv_springer

    marv_springer 1/2 ton status

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    Re: 56\" long rear springs

    Steve,

    As far as I know, 2wd and 4wd are the same - 4wd just uses a block.

    Avg price around here is ~ $100 from a wrecking yard. You might do better there, and then there's the shipping cost.

    Some info on donor springs:
    The springs fit 86 - 96 F-150's - and the newer the better. They are 2.5" wide springs (be careful here as many came with 3" wide), and they can be off a 2wd or 4wd truck. The ideal pack comes with 4 teflon padded leafs and 1 overload. Some packs come with 3 teflon padded leafs and one overload - and you can use these, but they will be more work for you as you will have to make and add at least 1 more leaf. You can verify that you've got the right springs by measuring the length: Total eye to eye (along arch of spring) = 57", front eye to center pin = 25", center pin to rear eye = 32". Also you'll want to get a set of springs with bushings in good shape or you will need to install new ones.

    Hope this helps....

    Marv
     
  19. FRIZZLEFRY

    FRIZZLEFRY 1/2 ton status

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    Re: 56

    I dont know if it matters.I got mine out of an 88 F150 2x.They have 4 leaves with the teflon pads and 1 over load witch I removed.I paid $100 for them at a yard here.

    Some people shouldnt drive anything bigger than their head.<a target="_blank" href=http://community.webshots.com/user/beaterwhang>community.webshots.com/user/beaterwhang</a>
     
  20. marv_springer

    marv_springer 1/2 ton status

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    Re: 56

    Hey Frizz... how'zithangin'...

    I was hoping you'd show up to comment on ride quality and living with the softer springs!

    Marv
     

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