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post #1 of (permalink) Old 01-30-2001, 02:26 PM Thread Starter
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Out of phase driveshaft to stop vibes?

I read a post on Topica from Dave of AAPA. He was saying that he ran his driveshafts 90 degrees out of phase on a lifted Zuk and it helped eliminate driveling vibes AND he didn't bust a U-joint for years. He did thins on advize from an "old driveshaft guru". Well, recently he decided to follow the FSM and phase the shaft properly. He developed vibes and then BLAM! he blew a u-joint.

He went back to 90* out and everything is fine. He took a spare shaft and put it in (in phase) and got bad vibes again.

Question, does this make any sense to anyone and why?

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post #2 of (permalink) Old 01-30-2001, 05:57 PM
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Re: Out of phase driveshaft to stop vibes?

Yeah 90* out of phase would fall under "allowing for output flange runout"
To me driveshafts are "whatever works" .

On 1 of my Toyotas ,I turned the rr drive shaft back to front & that helped w/ vibes quite a bit. A new t/c output bearing is what is needed to Cure it tho .


post #3 of (permalink) Old 01-31-2001, 09:05 AM Thread Starter
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Re: Out of phase driveshaft to stop vibes?

Hmmm, my T/C bearings are good, but I still get vibes. I thinks I goona try the 90* out of phase thing and see what happens.

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post #4 of (permalink) Old 01-31-2001, 09:47 AM
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Re: Out of phase driveshaft to stop vibes?

OK , you have my permission .


post #5 of (permalink) Old 01-31-2001, 09:58 AM
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Re: Out of phase driveshaft to stop vibes?

I have no idea whyit does it, but it doesmake a difference. When I had my gears installed, my Zook vibrated like crazy. After a long talk with the mechanic, (I strongly suggested he'd better fix it) he thought he may not have put the shaft back correctly. After a 90 degree turn, she ran great. The front shaft also suffers, turned it 90 degrees and it helps, but still has some vibrations, but I can live with it.
-You are not alone.

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post #6 of (permalink) Old 01-31-2001, 10:14 AM Thread Starter
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Re: Out of phase driveshaft to stop vibes?

Got a good explanition. All I had to do is ask my partner in grime, Yankee Bob. (Ang the right hand knows what the left hand is doing?)

Seems that the usual proper way of installing a driveshaft is to phase the shaft, but when you get to steep angles this can change.

Since a U-joint is on constant velocity (CV) as the angle of the shaft increases, the speed at which the driveshaft turns brings to vary, creating the vibrations that we have all come to know and love. By spinning the driveshaft 90*, it will lessen th effect of this problem. It took a little bit and actually holding a driveshaft and turning it to have him explain this to me.

Well, we are going to give it a shot on the rear shaft this weekend. I'll keep you posted. As for the front, I'll be going custom to make up for the super droop mods that are in store for my lift.

C'ya,

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post #7 of (permalink) Old 01-31-2001, 10:47 AM
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Re: Out of phase driveshaft to stop vibes?

Geez Tim, I don't understand what your TURNING?

The slip yoke in relation to the rest of the d-shaft?

I get a wicked vibe front the front on my truck.
I have the stock pinion nagle and 5.5" SPOA.
Would this help?

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post #8 of (permalink) Old 01-31-2001, 11:00 AM Thread Starter
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Re: Out of phase driveshaft to stop vibes?

It's the slip yoke. Pull it out, turn it 90* based on the line-up marks and reinstall.

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post #9 of (permalink) Old 01-31-2001, 10:52 PM
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Re: Out of phase driveshaft to stop vibes?

Tim;
I'm a little confused. Are you saying to mark the flanges on the driveshaft and the transfer case, pull the slip joint out of the tranny, rotate it 90 degrees, line up the marks on the flanges and bolt it back together? Is it the the driveshaft and the tranny shaft out of sinc? I installed a RX7 12A in my Sami and have a vibration. I am using the RX tranny and never knew there were alingment marks on the slip shaft. As my driveshaft is only 4 1/2" long I was only able to use one u-joint in the shaft. I shimmed up the tranny mount to make an almost perfect alinment on the flanges but I have a vibration in 4th and 5th gear between 45 MPH and 65 MPH. It smooths out above 70 MPH. Do you think maybe my driveshaft is out of sinc?
Later ...Harry...

post #10 of (permalink) Old 01-31-2001, 11:10 PM Thread Starter
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Re: Out of phase driveshaft to stop vibes?

Uh, if you are talking about the short shaft off the tranny to the t-case, no. I'm talking about the front and rear driveshafts to the axles

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