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U-joints gave and Driveshaft fell out today

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BillyBob, Dec 15, 2000.

  1. BillyBob

    BillyBob 1/2 ton status

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    Oh, I had a ton of fun today. I was telling my buddy (BigGray71) about the weird vibes I've been having lately. Now, I knew that my U-joints were probably going.. but, I also have a rear tire that may be out of balance. Anyway, we were going down the highway. The thing was vibing like hell.. but he thought it was the tire.. and it should be nothing to worry about. So I tell him to turn around cuz he's just wasting my gas... right before we get on the opposite side of the highway.. *POP-KA-BOOM*. We rolled to a stop.. and saw my driveshaft a few hundred feet away on the shoulder. Both U-joints gave out. Also, the T-case yoke completely broke where the U-joint caps were, and the cup at the end of the driveshaft blew in one place. I'm telling you.. ain't nothing makes ya crap in yer pants more than a huge bang, and "unknown smoke" (ATF from the T-case hitting the exaust... stunk like hell). Thank god for T-cases, front diffs and 4wd.. otherwise I woulda had to call a flatbed. Right now, my driveshaft should be getting refurbished at a drivetrain specialist place. $160 for a new end cup, balancing, labor and new U-joints... seems fair enough. I woulda gotten a whole new driveshaft.. but that was $270.. and I can't spend that kinda $ at the moment. I'm just hoping that it'll be as good as new. I took some pics of it ziptied to my brushguard before I handed it over for repair.. along with the yoke... whenever I finish off the film, I'll post 'em for fun. Just figured I should share my experiance an' all.

    [​IMG]

    http://billybob.coloradok5.com
    It's all fun 'n games, till someone gets stuck.
     
  2. mudhog

    mudhog THEGAME Staff Member Super Moderator

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    i have seen this happen i was right next to a guy and his broke. scared both of us lol

    s.smith 77blazer lookin 4 mud
     
  3. Chris Demartini

    Chris Demartini 1/2 ton status

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    <font color=blue>I'm surprised nobody ran over it! I think we should get drivesahft loops [​IMG] !!</font color=blue><font color=blue>
     
  4. Mudzer

    Mudzer 1/2 ton status Author

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    Man thats a hoot! SOrry to hear about that guys, but you will now get used to the sound and feel of a joint going bad. I carry a spare with me and always pull over at the slight hint of a vibration. I have learned to pull the shaft, press out the old, in the new in about 10 mins. YYYYYYYYYYEEEEEEEEEEEEEE HHHHHHAAAAAAAAAAAAAAAWWWWWWWWW! Dukes of Hazzard style pit stops!!!

    Mudzer 1978/91 K5
    <font color=blue>www.mudzer.coloradoK5.com</font color=blue>
     
  5. Chris Demartini

    Chris Demartini 1/2 ton status

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    <font color=blue>Yeah, I belive it only takes you 10 minutes. I would be good at changing u-joints too, if I still had those baby 1310 car joints [​IMG] ! just kidding.....</font color=blue>
     
  6. UseYourBlinker

    UseYourBlinker 1 ton status

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    What kind of tools do you carry in your rig?

    If it ain't a Chevy, don't raise it up!
     
  7. Chris Demartini

    Chris Demartini 1/2 ton status

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    <font color=blue>He's got a few spare joints and a basic tool kit. If it was the joint, we could have fixed it right there but the ears on one end of the shaft broke and the yoke broke too. It's all fixed now!</font color=blue>
     
  8. HarryH3

    HarryH3 1 ton status Author

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    Something to keep in mind to help determine where a vibration is. Your driveshaft turns a lot faster than your tires. If you have a 4.10 rear, then the driveshaft is turning 4.1 times for each tire revolution. Also, a bad u-joint will usually make itself felt on each half rotation of the driveshaft so now it's making 8.2 vibrations for each tire rotation.

    So basically, a u-joint will feel like you're driving a vibrator while a tire problem will just feel like you're on a slightly bumpy road. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    http://ThunderTruck.ColoradoK5.com
     
  9. Josh

    Josh Registered Member

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    How do you check the u-joints, and/or what is a normal maintance schedule. I get a bounce/vibration sometimes when I first start driving but it goes away. I shook the driveshaft and found no play.


    Josh Hefner
    '77 Jimmy
     
  10. drivelineman

    drivelineman 1/2 ton status

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    just a note - most of the time when you loose a joint lik that it damages the diff yoke or t case yoke - and every one calls it good until it goes bad in a month - your t case yoke is crutial for lift of the u joint - if it has any wear what so ever change it- if you can up grade to the next size joint its always a good idea to go larger along with your lift and tire-
     

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