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Question about using larger 9/16-inch diameter grade-8 U-Bolts...

Discussion in 'The Garage' started by 1-ton, Jun 3, 2005.

  1. 1-ton

    1-ton 1/2 ton status Premium Member

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    I am going to install a set of ORD zero rates on the front of one of my 1991 V3500 (Dana 60), but I need to get a set of longer U-Bolts.
     
    Last edited: Jun 6, 2005
  2. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    My U-bolts are 5/8" factory. I'm pretty sure every K5, K10, K20, K30 used 5/8" diameter U-bolts from the factory. :confused:
     
  3. 1-ton

    1-ton 1/2 ton status Premium Member

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    Maybe I have some of my specifications wrong. Feel free to enlighten me with any information anybody has. I got most of the specifications off of RockStomper's web site. I will call them on Monday for the "skinny", but for now it is the weekend, and I thought I would just post up some questions on the project until then.
     
  4. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    One other thing, if i'm not mistaken ALL U-bolts are grade 8 as well as ALL allen bolts are grade 8.
     
  5. 1-ton

    1-ton 1/2 ton status Premium Member

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    this is directly off of RockStompers web site.
     
  6. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Do yourself a favor and go measure the diameter of your existing U-bolts and that will answer your own question. Maybe rockstomper is incorrect on what they are saying. I have swapped many axles front and rear and they were all 5/8" diameter. I think the real early D44 used 9/16" diameter.
     
  7. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    every U bolt on my truck is 5/8" and they are the same size as the factory ubolts, just longer. i would not run anything less then 5/8"
     
  8. 1-ton

    1-ton 1/2 ton status Premium Member

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    I think the problem we are having here is you guys are talking about "nut" diameters, and RockStomper is talking about the actual "bolt" diameters.
     
    Last edited: Jun 3, 2005
  9. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    im talking about the bolt diameters, i think the nut diameters are 7/8" on the 5/8" ubolts, maybe its 13/16"

    you gotta remember, rockstomper and alot of the other places deal with smaller trucks (jeeps, toys, samaris, etc) and to them a 1/2" ubolt is standard. so when they say upgrade to our 9/16" bolts, you may wanna check what you have before you buy them.
     
  10. sweetk30

    sweetk30 professional hooker Premium Member

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    no not all ubolts are grd 8. up to 9/16 thay are grd 5 then it goes grd 8 . i use to work at a spring shop and we use to up them all the time to grd 8 .:cool1:
     
  11. RingMaster4x4

    RingMaster4x4 1/2 ton status Premium Member

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    shoot the Nuts on my u-bolts are 15/16 :blush:
     
  12. gone huntin

    gone huntin 1/2 ton status Premium Member

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    Yeah, my factory and replacement u-bolt nuts are 15/16" and the u-bolts themselves are 5/8".
     
  13. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    My U-bolts are 5/8" fine thread. Nut size is 15/16" and they came with the double tall nuts and hardened flat washers.

    Rene
     
  14. diesel4me

    diesel4me 1 ton status Premium Member

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    same here...

    Every GM truck I ever fooled with had 5/8" U-bolts and 15/16" hex on the nut size...stock factory ones anyway.. :crazy: ...
     
  15. 1-ton

    1-ton 1/2 ton status Premium Member

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    I got out my Venier Calipers, and measured my Dana-60 U-Bolt diameter. It definitely came out to .625 thousands of an inch, which equals 5/8. I just assumed that because RockStomper only seems to deal with Dana Corp stuff that the U-Bolts dimensions they where talking about pertained to Dana differentials. I will call them on Monday to get what I need.

    [​IMG]
     
    Last edited: Jun 4, 2005
  16. 1-ton

    1-ton 1/2 ton status Premium Member

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    My next question is where do you measure the length on a U-Bolt? I am assuming it is the straight part from where the U-Bolt bend ends up to the end of the threads. I am measuring approximately 7" using these measuring points, with an extra 1" of thread sticking out of the top of the U-Bolt plate. My guess is that I need an 8" long U-bolt to install the Zero Rates.
     
  17. CyberSniper

    CyberSniper 1/2 ton status Premium Member

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    You measure from where the bottom of the axle tube meets the U-bolt to the end of the threads.

    I believe Superlift #3418 is what you're looking for. It comes with longer studs. It should be plenty long but I'd call to ask. The 1/2 ton front kits I've bought are long enough for a pack 3.5" thick.
     
  18. sweetk30

    sweetk30 professional hooker Premium Member

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    yes tat is correct. but also measure the tube or the spread of the ubolt about where it rides on the axle tube. this will get you the width to go with the length. and if you want to help them out take 2x the length and add the width and this is the length rod you need. like 9" leg and 3" tube would bee 9x2+3=21" rod. but the rod only comes in even length so 22" rod. and when you bend ubolts round bends strech just a bit. square shrink just a bit. hope this helped you.:D
     
  19. 1-ton

    1-ton 1/2 ton status Premium Member

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    Thanx. I ordered that kit today from Summit Racing. After doing a lot of research on SuperLift's web site application catalog, I still cannot find the specifications for U-Bolt kit #3418, but Summit Racing is not going to ship the kit out until the 19th of June, so I have plenty of time to cancel the order, if I cannot get the specifications from SuperLift. As long as the U-Bolt length is 12"...it will work.
     
    Last edited: Jun 4, 2005
  20. 1-ton

    1-ton 1/2 ton status Premium Member

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    That is interesting formula. It is kind of like straightening out the U-Bolt, and measuring it's entire length.
     

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