What is the latest opinions on driveshaft phasing? - Team Camaro Tech
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post #1 of 4 (permalink) Old Aug 13th, 19, 03:21 AM Thread Starter
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What is the latest opinions on driveshaft phasing?

I've read a lot of threads about driveshaft phase. Whether the yokes should or should not be in-phase. Why Chevy made some out of phase in 1st gens etc.
Doing a search today the most recent post is from 2010. It's this very interesting one:

https://www.camaros.net/forums/27-tr...formation.html


The reason I ask is I have a 68 that originally came with 6 cyl 3 speed and the DS was out of phase. When I put in an 8.5 rear from a 74 Nova I had to have the DS shortened and the guy made it in phase. I've always had a little vibration I wonder if it has to do with the phase. I always keep my eye open for an original out of phase DS and if I find one that will fit I'd try it again.

So what's the latest thoughts?

Last edited by Winch; Aug 13th, 19 at 06:22 AM.
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post #2 of 4 (permalink) Old Aug 13th, 19, 05:52 AM
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Re: What is the latest opinions on driveshaft phasing?

Have you read THIS?

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post #3 of 4 (permalink) Old Aug 13th, 19, 06:30 AM Thread Starter
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Re: What is the latest opinions on driveshaft phasing?

I had not seen that. Very interesting. Now I know for sure mine was an original out of phase shaft. Hope I can find one some day just to see how it works.

Thanks
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post #4 of 4 (permalink) Old Aug 13th, 19, 05:04 PM
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Re: What is the latest opinions on driveshaft phasing?

If the power through a driveshaft was plotted on an X-Y chart, the result is a sine wave. This is by design of an universal joint.
Now shaft tube is tensioning and stretching through 360°.
Place one joint out-of-phase, now the resultant waveform is showing two sine waves with 32° of delay thus the shaft is being 'occupied' with longer compression/stretching forces.
Yes, SBC's & L6's came with out of phase joints because of low torque transmitted.

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