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Starting my 4 link rear...

Discussion in 'Center Of Gravity' started by willyswanter, Jan 9, 2004.

  1. willyswanter

    willyswanter 1/2 ton status GMOTM Winner

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    Bed skins:

    [​IMG]

    Bed Removed:

    [​IMG]

    Tubin!

    [​IMG]

    New shaved 14 bolt in...

    [​IMG]

    Rear shot showing new axle in place and all the unnecessary stuff removed:

    [​IMG]

    Whats left of the bed, hauling to dump in a bit...

    [​IMG]

    I'm also tubing out the back half of the truck along with the 4 link. Actual suspension work starts tomorrow evening, stay tuned!
     
  2. Bubba Ray Boudreaux

    Bubba Ray Boudreaux 1 ton status

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    Hope you paint your driveshaft. /forums/images/graemlins/thumb.gif

    What's your fabrication schedule like? I may have to come down for a few hours and check this shiznit out /forums/images/graemlins/thumb.gif
     
  3. willyswanter

    willyswanter 1/2 ton status GMOTM Winner

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    Paint my driveshaft? That things brand new, just a bit dirty... Anywho, I'm heading down south tomorrow to pick up some tires but I'll be working on it all day Sunday!
     
  4. dustinellis

    dustinellis Registered Member

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    what are your plans for it, what type of tubing are you using,dom,hrew, just curious.i plan on tubing the rear of my k5. /forums/images/graemlins/thumb.gif
     
  5. willyswanter

    willyswanter 1/2 ton status GMOTM Winner

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    Todays Progress:

    Rear axle bridge:

    [​IMG]

    Upper link axle end mounts:

    [​IMG]

    Overhead shot:

    [​IMG]

    [​IMG]

    Upper link frame end mounts:

    [​IMG]

    Finished:

    [​IMG]

    Another angle:

    [​IMG]

    Links are .25" wall right there and I have another .120" wall tube to slide over them so they will be .375" wall when done... I may make the lowers .500" wall just incase but I'm not sure yet...

    On the frame end mounts I'm going to cap the top and bottom of them for more strength and add a few gussets as well. Not going to finish weld everything till everything is done.

    Get the lower links done tomorrow and hopefully get the shocks in place...

    I'm using HREW for the bed... I have always used DOM for everything and vowed to never use anything else but DOM. But now I'm broke and need to get this done /forums/images/graemlins/rotfl.gif It was 1/2 the cost so welded seem sounded good at the time... The way it will be built it should offer plenty of strength other than the actual denting it will get when being bounced off things... Oh well, dents are cool /forums/images/graemlins/tongue.gif
     
  6. Bubba Ray Boudreaux

    Bubba Ray Boudreaux 1 ton status

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    On this picture:
    [​IMG]

    Are the holes for adjusting if you have to tune the setup?

    Looks pretty good, just clean that frame up, jeez it's dirty /forums/images/graemlins/rotfl.gif
     
  7. willyswanter

    willyswanter 1/2 ton status GMOTM Winner

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    No, I put them in because I was reading on riceownz.com that each "gofast" hole adds 7hp and 14ft/lbs of torque...



    Yes they are for adjustability. When I designed the 4 link I figured out my COG but now that the bed is gone and I'm tubing it out the COG has changed so I need the extra tweakability...
     
  8. az-k5

    az-k5 1/2 ton status

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    You are only putting one point of adjustment per link? I realize the price jumps when you use threaded ends and the threaded adapters at all pivots and I would do the same as you. Just wondering how hard it will be to get everything strait and in line? Are the solid pins in the axle links just for place holding? (I assume bolts will be used when finished) Looks great so far.
     
  9. willyswanter

    willyswanter 1/2 ton status GMOTM Winner

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    Well a 180 turn of the one heim only moves it out or in about 1/32"... Thats plenty small enough adjustment for me...

    Yes they will be replaced with 1" Grade 8 bolts, the bolt place was closed today so I used 3/4" EMT conduit I had laying around /forums/images/graemlins/thumb.gif
     
  10. az-k5

    az-k5 1/2 ton status

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    Okay sound like enough adjustability to me. 1/32 on a long wheelbase like yours might not even be worth it (try 2 full turns to get anything you'll notice /forums/images/graemlins/rotfl.gif /forums/images/graemlins/grin.gif)
     
  11. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    As always, you do really nice work. /forums/images/graemlins/thumb.gif

    However, that's got to be the tallest bridge I've ever seen on anything other than a top-loader! /forums/images/graemlins/eek.gif Should give some interesting numbers...
     
  12. willyswanter

    willyswanter 1/2 ton status GMOTM Winner

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    Yeah I wanted to get my roll axis as high as possible... And if I went any higher than that it would hit the gooseneck hitch at full compression... Once the lower links are done I get to go back and gusset and brace the poop out of that thing...
     
  13. zcarczar

    zcarczar 1/2 ton status

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    Looks good, Looks very good. Just curious what's the shear rating on the 1" bolts your usings and what size Heims are you using and are those the Rubicon Express joints on the frame?
     
  14. willyswanter

    willyswanter 1/2 ton status GMOTM Winner

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    Yep, large RE joints on the frame and 1-1/4" heims at the axle.


    As for shear strength, not sure on the exact spec of the bolt but assuming a 95,000 psi ultimate strength rating with a cross section of 0.7854^2" I get a single shear strength of 74,613 or a double shear strength of 149,226 assuming it's doubled.
     
  15. willyswanter

    willyswanter 1/2 ton status GMOTM Winner

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    Today!!!!

    Lower link axle mounts:

    [​IMG]

    Lower link frame mounts:

    [​IMG]

    Overhead shot:

    [​IMG]

    Suspension compressed to bumpstops, pinion rotation is perfect throughout travel:

    [​IMG]

    Flexy flexy, could go farther but the concrete hindered my progress...:

    [​IMG]

    Absolutely zero axle steer, this is why it pays to learn and design a proper 4 link system!:

    [​IMG]
     
  16. sled_dog

    sled_dog 1 ton status

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    nice man, that thing just get sweeter.
     
  17. zcarczar

    zcarczar 1/2 ton status

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    Very nice. You work shows the amount of time you spend in research and design. What values did you end up getting for your roll axis, anti-squat and the other ones I dont know the names of right now? /forums/images/graemlins/thumb.gif
     
  18. willyswanter

    willyswanter 1/2 ton status GMOTM Winner

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  19. Bullet

    Bullet 1/2 ton status

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    I probably don't need to chime in on this, but are the mounts a little too thin? Or is it kind of an optical illusion due to the shear size of the joints. In no way I am doubting you or you ability to fabricate. Just curious about those mounts. I have seen some of the projects you've done and they are awesome!
     
  20. willyswanter

    willyswanter 1/2 ton status GMOTM Winner

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    Yep, they are thin! 3/16" plate /forums/images/graemlins/eek.gif

    But! I am confident that as long as the unit is designed correctly thinner material can work successfully. Once you see the gusseting and bracing you will understand /forums/images/graemlins/thumb.gif
     

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