V1500 with 56" rear leaves...rare?

Discussion in '1936-Present Suburban' started by jtrux, Aug 17, 2019.

  1. jtrux

    jtrux 1/2 ton status Premium Member

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    I was always under the impression that half ton 4x4's had 52" rear leaves, however, mine has 56" springs.

    Is this normal or unusual?

    Also, if unusual, is the frame a 3/4 frame or a 1/2 frame with different holes in the rear?

    Next dumb question. Are there any appreciable differences between 1/2 and 3/3 frames that have been confirmed? If heard people say that the frames are different thicknesses and what not but has anybody actually measured and verified?
     
  2. K85 Octane

    K85 Octane Tacklin' Fuel Premium Member GMOTM Winner

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    V1500? What year is that?
    I know my 71 C10 frame was thinner than my 68 C20 lol
     
  3. jtrux

    jtrux 1/2 ton status Premium Member

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    1991
     
  4. Bent77

    Bent77 lil meanie Staff Member Moderator GMOTM Winner

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  5. jtrux

    jtrux 1/2 ton status Premium Member

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    Interesting. Thanks.
     
  6. jtrux

    jtrux 1/2 ton status Premium Member

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    I did measure my frame this morning and got measurements that ranged from .195 to .210 throughout half a dozen spots.

    1991 V1500
     
  7. kennyw

    kennyw N9PHW Premium Member

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    My guess is your suburban was ordered with a trailering package that gave you the 56" springs. My wife's 88 V1500 came with 52" springs but the frame has two sets of holes so the rear shackle could be positioned for either length spring.
     
  8. imiceman44

    imiceman44 Hoarder extraordinaire Premium Member

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  9. 1977k5

    1977k5 1 ton status Vendor

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    '81-91 Suburbans are all over the place, lots of 56's in 1/2 tons and 52's in 3/4 tons (and vice versa). Seems to be about a coin flip as to which length they got in 1/2 and 3/4 ton Suburbans, no idea what dictated which spring was used. The 56's aren't necessarily the heavier spring either.

    FWIW, '92-99 Suburbans use ~60" rear springs, shorter than the IFS pickups.
     
  10. kennyw

    kennyw N9PHW Premium Member

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    Does it have a G51 option code? I just picked up an 87 C10/R10 and it has 56" rear springs and a G51 option code "SPRING REAR, HEAVY DUTY, VAR 2"
     
    Last edited: Sep 2, 2019
  11. jtrux

    jtrux 1/2 ton status Premium Member

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    Nope
     
  12. K588

    K588 1/2 ton status Premium Member

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    I have a 90 GMC V1500 Suburban that also has rear 56" springs. I'll have to look for that G51 code, always figured it was some option package.

    No G51 code on mine.
     
    Last edited: Sep 10, 2019
  13. kennyw

    kennyw N9PHW Premium Member

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    This is the RPO sheet from the parts truck

    20190902_145417.jpg
     
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  14. USSkoval

    USSkoval Dunno? Premium Member

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    My '88 V1500 Burb had 52's originally, the holes were already in the frame when I put 56's under it. I've had a couple C20 Burbs and a couple other K20 Burbs, they all had 56"s. I'd really like to know why other Burbs had different length springs.
     
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  15. Babaganoosh

    Babaganoosh 1 ton status Premium Member GMOTM Winner

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    Here is a interesting one, my 82 c10 came with 56's
     
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  16. USSkoval

    USSkoval Dunno? Premium Member

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    A member on another site has a late 70's shortbed stepside with factory 56's as well. I though that was really odd.
     
  17. jtrux

    jtrux 1/2 ton status Premium Member

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    I had a 69 C10 parts truck with 350 (steel crank), TH400 and rear leaves.

    Sorta heavy duty for a half ton. Wish I had kept it whole.
     

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