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front u-bolt question

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by dyeager535, Sep 20, 2001.

  1. dyeager535

    dyeager535 1 ton status Premium Member

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    My front u-bolts on the passenger side went together oddly. I'm not sure where the problem is coming from, but I can NOT thread the nuts on the u-bolts fully.

    They are big nuts, so they have decent purchase on the threads, but even after driving it this way for months, I have to break out a wrench ever time I happen to glance at them, for fear they are working loose and my front axle is going to end up under the cab. I would certainly like to see some extra thread on both sides of the nut when its torque down.

    I've got 3 leaf front springs, (which are on the perches fine, and aren't sliding around, I checked) and stock u-bolts that had plenty of exposed thread when installed on other trucks, but when I put them on mine, same thing every time. Like the diff was cast too "thick" where the spring wraps around, but the one that bolts to the axle wouldn't have that problem, which it does too.

    Any ideas? I've got a bit of "clunk" when I turn a corner and hit a small bump as well, but its not transmitted through the steering wheel noticeably. Already checked all the joints, etc., and no problems there....


    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     
  2. wayne

    wayne 3/4 ton status

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    Best thing I can tell ya is to spend a few bucks and buy new U bolts and fix it once and be done with it.

    See <a target="_blank" href=http://coloradok5.com/gallery/Waynes-Toy>Project Mighty Mouse</a> here.
    <font color=blue>Wayne<font color=blue>
    <font color=blue>Happy Trails<font color=blue>
     
  3. Depdog

    Depdog 1/2 ton status Author

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    I saw you said passenger side. I dont know if you know this or not so if you do please dont take offence. The u-bolt that goes around the pumpkin is a little wider than the one that goes ont he axle tube, if you mix them up it may cause the more narrow one to bolt down kinda wedge style.

    Depdog

    <font color=blue>Weenie K5, little mods' Small Tires!</font color=blue>

    <a target="_blank" href=http://depdogsk5.coloradok5.com>depdogsk5.coloradok5.com</a>
     
  4. There is obviously something different about the front axle you have that makes it incompatible with stock u bolts. A good rule of thumb on thread engagement is at the very least the nut should be flush with the end of the bolt. If it isn't, you aren't fully utilizing the combination which could lead to the nut coming loose. I was looking at my front end combo (Dana 44 w/ two leafs), and I could add another leaf and still have about 1/8 of thread exposed after the nut. They do make u bolts with a longer shank that would give you the desired thread engagement. Any fastener supply should carry them. Also, I would highly recommend Nylok nuts on the u bolts if you don't already have them.

    God has a hard on for Marines, because we keep Heaven chock full of fresh souls!
     
  5. dyeager535

    dyeager535 1 ton status Premium Member

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    No offense taken! More often than not, the problem is obvious, just not to the person trying to find it : )

    Am I mistaken in my belief that the length is MUCH different between the two? The truck isn't here, so I can't check now.

    I *would* replace the u-bolts, but if one set of the u-bolts works on every other truck *but* mine, there must be something wrong with the truck, not the u-bolts. At least thats how i'm seeing it.

    I could fix the obvious, (bolts too short) but whatever is causing stock bolts not to fit may come back and bite me when it could be very harmful to myself or others.

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     
  6. Zepplin

    Zepplin 1/2 ton status

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    There is a big difference between the two u-bolts on the passenger side. I would say about a 3" or more difference!

    I have well over an inch of thread exposed on my U-bolts. I got the U-bolts new with my Skyjacker kit.

    74 Blazer
    Zepplin
    Check out my Blazer<a target="_blank" href=http://community.webshots.com/user/zepplin1976>http://community.webshots.com/user/zepplin1976</a>
     
  7. jarheadk5

    jarheadk5 1/2 ton status

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    Crazy question here, assuming you're still running a 1/2-ton front axle. If not, then ignore this...

    Did you swap between 10-bolt and D44? If so, did you re-use the same hardware with the truck? What I'm thinking (again, assuming 1/2-ton) is that maybe passenger u-bolts for front 10-bolt and D44 are somehow different. I've never heard about this, but I'm no authority, just brainstorming and tossing my 2 cents of gas on the fire.


    September 11, 2001--"A date which will live in infamy"
     
  8. dyeager535

    dyeager535 1 ton status Premium Member

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    Nope, 10 bolt stuff. I appreciate the brainstorming. I just figured it couldn't hurt to ask for some other opinions. Never know what anyone else has run into. I pulled three sets of these u-bolts off other trucks, and none of them fit any better. its not 'cause they are used, because they came off of trucks WITHOUT the same problems mine did. Oh well, gonna have to re-evalutate. If the axle falls off, guess I'll have to try something else ; )


    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     
  9. Man, if I were you I would take a proactive approach and go to a fastener supply and get some longer shank u bolts. I'm sure there are some in the Seattle area. You certainly do not want to have that axle come out from under the truck.

    God has a hard on for Marines, because we keep Heaven chock full of fresh souls!
     
  10. 84_Chevy_K10

    84_Chevy_K10 Banned

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    There's a spring shop by my house that will make you whatever u-bolt you want, any length, any size. That's what I'd do if I were you. they're only $5 each.

    Three of my fronts are 9/16 thread by 3" wide and probably (just a guess) 6" long. My big one up front is 3 3/8" by probably 10" long. I am guessing on the length because they came with my lift kit, I did NOT have the front ones made. I know that the width is correct though.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     

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