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spring eye bolts

Discussion in 'The Garage' started by 78Suburban, Jun 13, 2006.

  1. 78Suburban

    78Suburban 1/2 ton status

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    I know I've asked this before, but I never did get an answer, and I can't find it searching.

    What is the spring eye bolt size for the front springs (I think its 2 different sizes, one for the rear eyes and another size for the front eyes)?

    What about the bolt sizes for the rear 52" springs (I think I'm gonna do a shackle flip.

    Any part numbers for rear spring bushings and u bolts? Is it possible that I could get away with doing a shackle flip and not messing with the old spring bushings in the rear, or is that asking for trouble?

    thanks,
    james
     
  2. steve_kibbe

    steve_kibbe 1/2 ton status

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    If you do the shackle flip, you don't have to take the ubolts off.

    You can also use the bushings you already have, and up grade later.

    Front spring eye bolts are 1/2 inch for the front, and 7/16 for the rear at the shackle IIRC
     
  3. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Front eye bolts on mine are 9/16" from the factory. Depending on year the rear bolts did change size. i think up to 1987 they were 7/16" then 1988 on they were 1/2"
     
  4. 78Suburban

    78Suburban 1/2 ton status

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    Cool. I guess I can just measure the stock ones to get the correct length. Will I need washers to go under the nuts I assume?

    thanks,
    James
     
  5. goldwing2000

    goldwing2000 Guest

    You people are thinking of wheel studs or something. I just put on new rear springs and all of the bolts are 9/16-12 x 4.5" on both my '80 and my '89.

    I don't know about the fronts but I imagine they're probably the same. If the bolt head size is 13/16", then it's a 9/16" bolt. If it's 3/4", then it's a 1/2". If it's 11/16", then it's a 7/16". Nut sizes are usually one wrench size larger.

    If you buy 1/2" bolts, you'll be going back to the hardware store. If you buy 7/16", then you're smoking crack. :eek1:

    Yes, you'll need two flat washers per bolt and ALL METAL lock nuts (none of that nylon insert crap). And be SURE to buy grade 8.
     
  6. 78Suburban

    78Suburban 1/2 ton status

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    lock nuts... hmm... I've had ones with plastic before, but what consititutes an all metal lock nut, got any pics? I'm such a noob.

    And I am asking about the fronts. But its nice to know the rears too, since I'll be doing a shackle flip.
    thanks,
    James
     
  7. goldwing2000

    goldwing2000 Guest

    All metal lock nuts are crimped at the top so they squeeze the bolt. They're also known as "deformed thread" lock nuts. They look like this:

    [​IMG]
    Grainger has them for $12.11 for a pack of 50.

    Throw a wrench on those front bolts and that will tell you what size they are. That's why I wrote all that stuff down for you.
     
  8. 78Suburban

    78Suburban 1/2 ton status

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    Thanks :D
     
  9. timmay

    timmay Registered Member

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    I smoke crack. The factory size bolts for the rear eye of the front spring up to '88 are 7/16" diameter.
     
  10. steve_kibbe

    steve_kibbe 1/2 ton status

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    Goldwing2000, before you say we smoke crack, you better know whet you're talking about.
     
  11. 78Suburban

    78Suburban 1/2 ton status

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    so for the front springs, its 7/16 for the rear eye, 9/16 for the front eye


    and for the rear springs its 9/16 all around

    and I need washers and locknuts all around

    have I got it right now?
     
  12. YZEATER

    YZEATER 1/2 ton status

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  13. goldwing2000

    goldwing2000 Guest

    That's why I told him to stick a wrench on them to figure out the bolt size.
     
  14. Chevy305

    Chevy305 6 Lug 14bsf Status Premium Member GMOTM Winner

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    BTW, not many harware stores carry grade 8 7/16 bolts that are 5" long. 5" is an odd size and believe me I went to every harward store within 30mins of me and not one of them carried such a bolt, so I ordered min from http://www.mcmaster.com
     
  15. 1-ton

    1-ton 1/2 ton status Premium Member

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    The major hardware chains do not carry 7/16" bolts or nuts...period. I have to go to a specialized Industrial Hardware Supply to get any 7/16" nuts and bolts.
     

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