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square drivelines

Discussion in 'The Garage' started by sams78chevy, Apr 3, 2006.

  1. sams78chevy

    sams78chevy Registered Member

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    I was just wondering how to make one of these. Any dimensions would also help aswell as pictures. Thanks for the help.
    Sam
     
  2. Masiony

    Masiony 1/2 ton status

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    take your driveline, cut off the yokes, then use two pieces of square tube that fit inside each other. most will say something like 1/4 wall, but i have seen people twist those. i personally will be running reciever tube, the kind that trailer hitches are made from. get your truck on something that will flex it out, then measure with the diff side stuffed as far as it will go, that is how short both pieces need to be minus any length from the yoke. hopefully when you droop the diff side, it is not more than 2x the lenght that the stuffed side was. if it is more than 2x, then you are screwed.
     
  3. mikey_d05

    mikey_d05 1 ton status GMOTM Winner

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    Cut yokes off old driveshaft.

    1 piece 2.5" .25" wall tube

    1 piece 2" .25" wall tube, grind to clear seam on larger tube.

    Weld yokes to ends, lube it well, assemble and thrash.
     
  4. Masiony

    Masiony 1/2 ton status

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    only 2 inches long eh? dont you think that will be a little short?

    will that lenght fit applications axle moved a few inches forward? what about the amount of lift?
     
  5. mikey_d05

    mikey_d05 1 ton status GMOTM Winner

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    Yep, 2" would be short if I were referring to the length and not the OD...
     
  6. Masiony

    Masiony 1/2 ton status

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    damn, this whole time i thought you made the mistake. oh well guess im the ass this time.
     
  7. mikey_d05

    mikey_d05 1 ton status GMOTM Winner

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    :haha: :p:

    No worries.
     
  8. Masiony

    Masiony 1/2 ton status

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    whats your take on the strength of the 1/4 wall? what about reciever tube?
     
  9. colbystephens

    colbystephens 1 ton status GMOTM Winner

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    what's the advantage to a square shaft?
     
  10. Masiony

    Masiony 1/2 ton status

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    strenght, and long slip
     
  11. mikey_d05

    mikey_d05 1 ton status GMOTM Winner

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    .250 wall is beefy. A standard d-shaft tube is nowhere near that thick. In that diameter of square tube, it's pretty well bomb proof. I seriously doubt anyone could twist it. Also, I don't know from experience, but I've heard they're damn near impossible to bend in the rocks. I'm sure smaller stuff can get kind of weak but .25" wall 2" OD square tube is "receiver tube" with a seam, just to give you an idea.

    The advantage of square shafts is that they're cheap, home brew, unlimited slip, and you can carry one as a spare since it's bound to fit both front and rear if you run the same joints.
     
  12. Masiony

    Masiony 1/2 ton status

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    ive seen somebody twist a .25 wall, and not break the 1350 u-joint next to it.
     
  13. mikey_d05

    mikey_d05 1 ton status GMOTM Winner

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    Was it round our square? If it's square did they build it properly? What was the OD of the tube? Where did it twist? I'm honestly curious. Remember if you build a square shaft for a certain application (and not a spare) the small tube should be inside the large tube for nearly the entire length and only be short enough to allow for full suspension compression...essentially sleeving the tube with another .25" wall tube.
     
  14. DavidB

    DavidB 1/2 ton status

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    What if you made the male smaller or the female larger to allow room for some strips of UHMW on each side of the tube for slippage?


    Reciever tube may be stronger, and of course seamless.
     
  15. Masiony

    Masiony 1/2 ton status

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    the male will always be smaller, and nothing is needed other than maybe some grease.

    the driveline was 2" and 2.5" square tube .25" wall. it twisted from the weight of a 60, and 40" boogers coming down hard on the front end. im not sure if it twisted both pieces or just one, but it tore the output of the 205 when it came down cause it couldnt compress due to the twist.

    he is now running like .5 wall or something rediculous like that. i doubt i could break .25 wall, but i know he did.
     
  16. DavidB

    DavidB 1/2 ton status

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    The UHMW would cut down on the uncool rattle.

    And, uh yeah...the male should be smaller....than the female.
     
  17. Masiony

    Masiony 1/2 ton status

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    too complicated. just tap it for a zerk.

    and who can hear that rattle over any of the other 15 rattles a old chev makes.
     
  18. Mudgod

    Mudgod Registered Member

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    My doesn't rattles when its in 4 wheel drive. One of the best things I like about it is if you break a U-joint you don't have to remove both ends, only the end that broke.
     
  19. gravdigr

    gravdigr 1/2 ton status

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    The downside to a square shaft is it can bork up your tranny and tcase. The slip yoke on a square driveshaft has way more friction under torque than the splined round shaft does. When your slip yoke is under torque and you try to compress the suspension you are putting a lot of force on your output shafts and will actually be pushing them into the case when you try to compress your suspension.

    Dunno if that made sense...it makes sense in my mind and I have read about it but don't seem to have the words to explain it right.
     
  20. mikey_d05

    mikey_d05 1 ton status GMOTM Winner

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    Makes perfect sense, it's a huge downfall of square shafts. IIRC people have cracked tranny cases because of it. I keep mine full of grease and don't plan to run it all that long just because it makes me nervous. They definitely have their advantages though.
     

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