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Transmission flange failing

1644 Views 12 Replies 4 Participants Last post by  vintage42
Hello! I just started replacing my guibo for my 99 z3 roadster, because of some clunking between 2 and 3000 rpm, and when I got the old guibo out I saw these chippings or whatever you might call it. The bolts holding the guibo were also kind of like this, looking like something had been rubbing on it, or chipping it or something. I really don’t understand what has happened. I find this super strange! Do anyone know what is happening and is there anything I could do against it, or should I just replace it?
Best regards Jon

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It looks like the Giubo has failed, so the driveshaft bolts have been hitting the output flange. What do the opposite bolts look like?
Yeah the guibo was torn to pieces, and the bolts look bad. And I just noticed where the drive shaft connects, it has the same markings. Pics below. Do you think I need to replace the whole driveshaft because of it?
Thanks,
Jon

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I think it's OK to re-use the transmission output flange since the damage does not affect the mounting bosses. You will need to periodically inspect it, though. I wouldn't re-use the driveshaft side since it looks like those bosses are damaged.
Ok, thank you for your help!
Do you have a recommendation to where I could buy a driveshaft? (I?m new to the bmw scene)
New or you could try Used
Do you have a recommendation to where I could buy a driveshaft? (I?m new to the bmw scene)
Thank you! I will try to get a new driveshaft so the car will be ready for when summer arrives!
Not bad bolts, it's just what can happen to the bolts when the giubo goes bad.

The link in #10 shows what can happen if the car is driven too long with a deteriorated giubo. The bolts wiggle and wear, elongating the holes in the output flange.

Your post said "when I got the old guibo out I saw these chippings or whatever you might call it. The bolts holding the guibo were also kind of like this, looking like something had been rubbing on it, or chipping it or something."
Any "chippings" you saw could be from the bad guibo allowing the bolts to wiggle, though I did not notice chippings or damage in your photos.
Ok I understand. This is the damage I?m talking about (pics below), and it makes sense that the bolts might do that.
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, though I did not notice chippings or damage in your photos.

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The circled areas don't appear to be related to the bolts. They look more like imperfections in the casting, not damage. Your bolts and holes look OK to me.
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