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Keep blowing upper rear ujoint!!!

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BorregoK5, Oct 31, 2001.

  1. BorregoK5

    BorregoK5 1/2 ton status

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    I keep blowing my upper rear u-joint at the transfer case. I'm only running 4" of lift, the tcase output shaft and the yolk are parallel with each other, I've got a little concern over the driveshaft being balanced which is the aproach I'm heading down now. Everything at the tcase and yolk are in good shape (bearings , seals , etc.)What else could cause this? I always get the greasable kind and keep them greased up but this is getting rediculous ( second one in one week!)

    Three 4-6 foot air launches and not broken yet! - <a target="_blank" href=http://www.echobit.com:81/k5/> Pictures</a>
     
  2. MudFrog

    MudFrog 1/2 ton status

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    2 in one week?
    Maybe it's the 4 - 6 ft air launches [​IMG].

    89 K5 Silverado, 4", 33's, 3/4 ton axles
    <a target="_blank" href=http://mudfrog.rockcrawler.com>http://mudfrog.rockcrawler.com</a>
     
  3. BorregoK5

    BorregoK5 1/2 ton status

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    Yeah, I suspected that with the first one.. but I've been strictly commuting this week, and they still keep blowing. I should change that to 4-6 foot air and only one u-joint! [​IMG]

    Three 4-6 foot air launches and not broken yet! - <a target="_blank" href=http://www.echobit.com:81/k5/> Pictures</a>
     
  4. MudFrog

    MudFrog 1/2 ton status

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    Nah... Ujoints don't count [​IMG].


    89 K5 Silverado, 4", 33's, 3/4 ton axles
    <a target="_blank" href=http://mudfrog.rockcrawler.com>http://mudfrog.rockcrawler.com</a>
     
  5. HarryH3

    HarryH3 1 ton status Author

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    Are the ujoints breaking or just overheating? The u-joint should move very easily in both planes if it's installed correctly. If you have the bearing cups pressed against the end of the cross shaft, then the joint will overheat and burn out the grease pretty quickly.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  6. BorregoK5

    BorregoK5 1/2 ton status

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    When I replace them, the movement is firm but not stiff (cross to cap). Over a few days, a vibration will develop and I can see the cross busting the caps out the inside of the retaining u-bolts of the transfer case yolk. I recently replaced the t-case yolk due to previous damage(nearly pogo'd when it gave), new retaining u-bolts and u-joint.

    Three 4-6 foot air launches and not broken yet! - <a target="_blank" href=http://www.echobit.com:81/k5/> Pictures</a>
     
  7. dogman

    dogman 1/2 ton status

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    just a suggestion: make sure the cap of u-joints are inline with the u-joint caps on the other end of the drive shaft. also if your driveshaft is bent, just enough to change the balance; you will dust your u-joints.
     
  8. HarryH3

    HarryH3 1 ton status Author

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    Check out this thread: <a target="_blank" href=http://coloradok5.com/forums/showflat.php?Cat=&amp;Board=blazer4x4&amp;Number=112382&amp;page=&amp;view=&amp;sb=&amp;o=&amp;vc=1>http://coloradok5.com/forums/showflat.php?Cat=&amp;Board=blazer4x4&amp;Number=112382&amp;page=&amp;view=&amp;sb=&amp;o=&amp;vc=1</a>

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  9. chvyhs

    chvyhs 1/2 ton status

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    I completely twisted my drive shaft once, so I had a new one made. After I installed it I keeped ruining u-joints. It ended up being a bent transfer case yoke and me tightening my u-bolts too much. good luck.
     

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