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Blown U-joints-- cause?

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by ErikH, Jun 30, 2001.

  1. ErikH

    ErikH 1/2 ton status

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    As soon as I bought my '71 in February of this year, I replaced the worn u-joints in the rear driveshaft. Now, just a few months later, the front u-joint has completely blown. I almost didn't make it home last night.

    I noticed that when I replaced the joints, they didn't take much force to insert them. Could this have been the problem? What else would cause this to happen? And how much would a new shaft cost? Any good sources out there?

    And lastly, how do I change the "stranger" tag I see under my name? I can't find out how to change it.

    Thanks,
    Erik
     
  2. Rasberry

    Rasberry 1/2 ton status

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    Well as far as the U-joints go, that Blazer has had some wear and tear on it after 30 year of abuse. Eventuallly you have to replace all off them. As far as the stranger tag, you'll have to post a lot of notes to get rid of that.

    Rasberry 71' K/5 Blazer
    <A target="_blank" HREF=http://www.geocities.com/71blazer>http://www.geocities.com/71blazer</A>
     
  3. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    after 25 'posts' you'll become a 'newbie'. At 50 i think its member or enthusiast or something...sorry, its been a while.

    The titles change the more you post until you hit 2500 posts and then you'll be 'Carpal Tunnel'

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
     
  4. rocko

    rocko 1/2 ton status

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    If your u-joint's went in without lots of force.. the yoke.. could be ovaled out... meaning the ujoint's made the yoke opening's larger.. Over time.. the u-joints will just let go.. cause they are not properly seated..
    Or you might have forgotten to install the clip rings.. or the c-clips which hold them in...
    I've forgotten to do that once...
    My guess is you need to replace the whole driveshaft where the u-joint slips into the yoke...


    A well armed society is a polite society. <A target="_blank" HREF=http://www.rocko.rockcrawler.com>http://www.rocko.rockcrawler.com</A>
     
  5. ErikH

    ErikH 1/2 ton status

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    Thanks for the reponses. I'm guessing I'll need to get a new shaft.

    New question: Would it be bad to drive with just the front axle engaged for a 1/2 day (with the rear shaft removed) or should I find a ride to a driveline shop?
     
  6. Triaged

    Triaged 1/2 ton status

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    That should be fine. If you have a lift and the angle of the front driveshaft is bad it will vibrate at high speed

    '71 Blazer CST with alot of rust
     
  7. FRIZZLEFRY

    FRIZZLEFRY 1/2 ton status

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    The holes where the u joint go in my slip yoke were worn and letting the cup spin in the yoke but they fit tight in the shaft.Went down to a driveline shop here in town and they had a new slip yoke in stock.I dont remember how much but it wasnt too bad.But you dont have a slip yoke so Im just gonna go back to sleep now.

    <A target="_blank" HREF=http://community.webshots.com/user/beaterwhang>http://community.webshots.com/user/beaterwhang</A><P ID="edit"><FONT SIZE=-1>Edited by FRIZZLEFRY on 07/02/01 07:37 AM (server time).</FONT></P>
     
  8. Klef72K5

    Klef72K5 1/2 ton status

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    Over tightening the nuts on the U-bolts will also put a increased amount of pressure on the roller bearings causeing them to fail.25-30 ft/ lbs. is all they are to be.
    This sounds stupid but have you ever greased them? Way to many people don't!

    <A target="_blank" HREF=http://wsphotofews.excite.com/031/rw/Jo/og/t488200.jpg>http://wsphotofews.excite.com/031/rw/Jo/og/t488200.jpg</A>
     
  9. Steve_Chin

    Steve_Chin 1/2 ton status

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    Question: Did you pack the U-joints or install them straight out of the box? The petrolatum that they put in the U-joints out of the factory is for corrosion resistance only. It will not stand up to the kind of loadings a driveshaft will impart.

    I think that a lot of the new universal joints that are coming out are also junk, or at least that there have been some bad batches of the things. I bought some new universals from a Napa auto parts store last year, packed them, installed them, and they lasted less than three weeks in my Blazer. I replaced them all with Spicer universal joints and no problems since. From now on, I only buy real Spicer universal joints and no other brand.

    A new driveshaft will run about $250 and should come with universal joints.
     

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