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Carbon fiber driveshaft?

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Old Oct 19, 2021 | 03:37 PM
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Default Carbon fiber driveshaft?

Just curious if anyone is running a CF driveshaft, or knows of experience with one. I'd like to take a touch more weight off the car, and the failure mode of CF shafts seems safer than metal shafts.

Thanks for any info.
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Old Oct 19, 2021 | 04:16 PM
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I replaced one in a C6, wasn't cheap. A custom made one may cost over $1000. Might want to try these guys: https://driveshaftshop.com/custom-applications/
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Old Oct 19, 2021 | 08:48 PM
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I have been running carbon fiber half shafts (solely to save weight) for over 15 or so years with no problems. I got them from Vansteel, don't know if they're available now. I considered a fiber driveshaft also, but the smallest diameter available was 3 1/4" which was too large to fit in the tunnel. I opted for an aluminum driveshaft instead, 3" diameter, barely fits but OK.



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Old Oct 19, 2021 | 08:56 PM
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Old Oct 20, 2021 | 12:50 AM
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To be strong enough to take the torque loads, the driveshaft (and half-shafts) need to be a fairly large diameter, considering that CF shafts are just hollow tubes.
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Old Oct 20, 2021 | 09:09 AM
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Not worth it! You still have the metal ends and u-joints which are the weight. I have a chromoly with billet steel caps and 12 point ARP bolts. You have to remember that mine is only 29.5 inches long. So I only have a smaller diameter maybe 2.5 inch chromoly VS CF. Where to save weight is really light weight wheels and I got rid of the parking brake assembly that I never used anyway. I have a front roll control to lock the front tires if I had to, but it would be drawing some current
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Old Oct 20, 2021 | 09:13 AM
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Originally Posted by C3 Stroker
I have been running carbon fiber half shafts (solely to save weight) for over 15 or so years with no problems. I got them from Vansteel, don't know if they're available now. I considered a fiber driveshaft also, but the smallest diameter available was 3 1/4" which was too large to fit in the tunnel. I opted for an aluminum driveshaft instead, 3" diameter, barely fits but OK.



What are those brackets welded to the diff cross-m?
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Old Oct 20, 2021 | 02:58 PM
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Muffler hangers?
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Old Oct 20, 2021 | 03:36 PM
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Originally Posted by ratflinger
Muffler hangers?
That is my guess too.

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Old Oct 20, 2021 | 03:48 PM
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Originally Posted by 7T1vette
To be strong enough to take the torque loads, the driveshaft (and half-shafts) need to be a fairly large diameter, considering that CF shafts are just hollow tubes.
Yes.......my half shafts are 3.5" in diameter. Most of the CF driveshafts are also 3.5" diameter. Too big to fit in the C3 tunnel.
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Old Oct 20, 2021 | 03:53 PM
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Originally Posted by gkull
What are those brackets welded to the diff cross-m?
They were for the exhaust or spare tire tub, I forgot which.
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