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Discussion Starter #1
So heres the scoop. I have a vibration coming from my rear driveline. The Driveshaft is brand new and the yoke are lined up within 1 degree. Is there anything else that would cause a vibration. Both yokes are tight so there is no play there. Any ideas?
 

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You didn't say so I'm going to ask... is this a CV driveshaft, and also how much angle does the driveshaft have?
 

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Discussion Starter #3
Oops, I forgot that part. It is a standard u-joint shaft that is 25.5 inches long and at about 19 degrees relatvie to the ground. My rig is sprung over on modified wrangler packs and sheet metal trimming so it is not up in the air.
 

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If I remember right, maximum angle is 11* with standard u-joints. I do know we have set them up FAR past that before with no vibes though. I wish I had a picture of the CJ5 we just did, 22.5" shaft and probably at LEAST 35*.
 

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I checked my numbers over at Tom Woods website and found this:

Bear in mind that with a driveline pushed to this 15 degree limit you may notice a slight (slight can be a matter of definition) vibration on smooth highway at about 45-50 M.P.H. when you flutter the gas just right. Most people can live with this. When in doubt or if you are near this upper limit, I recommend that you install a double cardan (C.V. ) type drive shaft. Remember that the geometry you need to maintain is different from that of a conventional 2 joint driveline. The cost differential is minimal and the performance/life gain will pay for itself in the long run.
 

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Discussion Starter #6
yeah the guy I get my shafts from says that the angle is fine. I have a friend that is running almost the same setup and is much taller than I am and he doesn't have the problem. I am at my wits end with the vibration. I don't know what to do
joe
 

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Discussion Starter #7
How are they measuring the angle though. It is relative to the angle of the yoke. If the yoke is at 5 degrees and the shaft is at 19 then the actual angle is 14 degrees. So actually I should be great on angle. I don't know. I am going to remeasure tonight but that is the numbers from the first time I measured.
 

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Correct. If both your front and rear yokes are at 5* and the shaft is at 19*, then your actual shaft angle is 11*. My TJ is set up similar to this because my engine is lifted. The rear angle is about 0* though since I have a CV shaft.

There is a cheap way for you to get a CV rear, if you get a front driveshaft and t'case output yoke from a Waggy, you can shorten the shaft and use it in the rear (of your Jeep).
 

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Discussion Starter #9
I really don't want a CV shaft. they cost more and when they break your FAWKED!! As it is I just put in a new joint I'm done.

Plus I just had this shaft built so that isn't an option. I would rather deal with the vibration. I don't care about it I just don't want to keep wasting joints on the thing. I know it is fixable. I just don't know what to fix.
I like the Waggy CV idea though. I will use that next time I need a shaft.
joe
 

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What about your pinion and t-case output bearings?
 

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I have a different set up than you, but i was also fighting driveline vibrations. Mine ended up being the output shaft of the t-case was bent. Changed it and all is great now. Maybe an idea for you to check.
 

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Discussion Starter #12
Well I guess this topic isn't going to fade away fast enough for me to hide. I figured out what the vibration was. I had neglected to unlock the front axle when I took it for a drive. I was spinning the front shaft which is a little out of balance. <IMG SRC="smilies/clown.gif" border="0"> Once I unlocked it the heep was vibration free and rocking the box this weekend. Thanks for all of the ideas. I didn't want to delete this post because there is a bunch of good tech ideas. I will suck it up for the good of all with driveline vibrations.
<IMG SRC="smilies/emb.gif" border="0">
Joe
 

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Originally posted by joep:
<STRONG>Well I guess this topic isn't going to fade away fast enough for me to hide. I figured out what the vibration was. I had neglected to unlock the front axle when I took it for a drive. I was spinning the front shaft which is a little out of balance. <IMG SRC="smilies/clown.gif" border="0"> Once I unlocked it the heep was vibration free and rocking the box this weekend. Thanks for all of the ideas. I didn't want to delete this post because there is a bunch of good tech ideas. I will suck it up for the good of all with driveline vibrations.
<IMG SRC="smilies/emb.gif" border="0">
Joe</STRONG>
Well thats the easiest fix for a rear driveline vibe I have ever heard. Just take it out of 4wd <IMG SRC="smilies/thefinger.gif" border="0">
 

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Discussion Starter #14
Yeah, I think I had one too many frosty ones that night. <IMG SRC="smilies/beer.gif" border="0">
 

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On my CJ when mine would vibe with the hubs locked, I knew one of my damn hubs was coming loose again. Never got around to converting it to studs, sold it for more than I bought my TJ for. <IMG SRC="smilies/biggrin.gif" border="0">
 

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Discussion Starter #16
I have the warn hub conversion on mine so there aren't any bolts to come loose. It's either the pinion angle on the front or the shaft is a little out of whack. Anyway, I'm not worried about the front too much.
joe

Is there a take to bottom function?
 
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