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I finally had a look under my car today to have a look at what I suspected was a drive shaft guibo failure, and found that it was more than just that:

http://[url=https://www.flickr.com/photos/thechadzone/16199947572/] Untitled by thechadzone, on Flickr[/URL]




http://[url=https://www.flickr.com/photos/thechadzone/16014671759/] Untitled by thechadzone, on Flickr[/URL]


I'm particularly upset by this because I don't currently have the facilities needed for such a repair (mid-divorce...). My skills are marginal, but my tool box is well stocked. I'd really appreciate some step by step suggestions on a course of action based on the pics.

My sincere gratitude to those with responses. I've been able to keep my Platinum on the road for 2 1/2 years and 15000 miles, but this looks daunting.
 

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We've put 98k miles on our 89 Milano, and have never had a failure of the drive line, but don't like seeing this failure. Do you do hard shifting? Or, possibly it was a mismanufactured and thus misaligned part, resulting in a prying load on that lug eventually causing a fatigue failure?

I would suspect a flaw in the part.
 

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My question is why is there a lock nut on that side of the yoke???
In other words, each yoke has three stud bolts protruding, over which the guibo is fitted.

I'd say the driveshaft yoke has failed because someone has patched up a stripped stud bolt with another stud bolt with a lock nut at both ends.

I agree with the previous post and would consider getting a secondhand unit from somewhere rather than muck around with trying to repair what you have.

Good luck with it.

Frank.
 

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Woe not, all you need to do is replace the driveshaft.

That piece missing, alone, probably won't any vibration if that's the only problem. There is a spherical bearing (locating device) inside the shaft at center and rear Giubos. However, that missing chunk looks to be worn away by the bolt (looks too shiny to have been like that from trauma and then left alone).

Doesn't really matter though - if you want to repair it you'll need a whole new driveshaft to be sure no vibrations (supposedly the halves are balanced once assembled). After you get your used unit they're easy to rebuild and the only "special" tool you need is a 36mm socket to remove the center support + bearing.
 

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The question would be why it broke. I've not see that particular problem in the past. I'd check the condition of the engine mounts and the transmission mounts to see if they are hosed and allowing something to sag and put undo stress on the drive shaft.

Kevin
 

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The question would be why it broke.
A loose bolt that enabled it to vibrate? Minor damage that initiated metal fatigue?
 
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