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Old 11-10-2013, 07:46 AM   #1
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Drive shaft vibes

I have a 03 rubi and i have drive shaft vibes that will vibe on and off when i drive over 70-75kms iv checked both the center nuts at each end of the drive shaft but it seems the issue is the slip yolk on the front drive shaft it had no dust cover so when i got the jeep it had not been maintained so iv been pulling it apart and cleaning out the old brown grease with a paper towel and packing new grease in it and its been slowly removing all the crap but it seems that the york was already to worn down. Now when i look at it when its apart i can see some sort of a rubber/plastic sleeve on it can u replace that or is my drive shaft done

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Old 11-10-2013, 10:42 AM   #2
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A picture is worth a thousand words

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Old 11-10-2013, 10:45 AM   #3
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A picture is worth a thousand words
And even the thousand words are useless without any punctuation whatsoever ....



And I doubt the slip yoke is the root cause of your vibrations. Sounds like driveline angle. Post pics.
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Old 11-10-2013, 10:50 AM   #4
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I let that slide, he's from Canada
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Old 11-10-2013, 11:58 AM   #5
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Let's figure out if the vibration is coming from the front or rear driveshaft. Are you up to pulling your front driveshaft completely off & drive for a couple days without it? That way you can see if the vibes go away or stay which will isolate it to the front or rear driveshaft.

Usually, such vibes are caused by a bad u-joint or a bad pinion angle.
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Old 11-10-2013, 04:34 PM   #6
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Jerry, say the vibes are still there, even after pulling the shafts individually. And swapping tires around changes nothing. What could that be?
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Old 11-10-2013, 04:55 PM   #7
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I wouldn't bet on that hypothetical situation happening.
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Old 11-10-2013, 06:58 PM   #8
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I was wondering because it has happened. Im still dicking around with it. Only thing that was changed was 3" rear lift, and mml. Mml caused worse vibes then without. Took the 3" out and put stock rear with 2" spacers back in. Still worse then before. I had no vibes with stock rear+spacers, and slight vibes with the 2" bds rear(which a 1/4" tc drop fixed). Im worried my output shaft got bent when I drooped with 3" rear and 1" tc drop
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Old 11-10-2013, 09:10 PM   #9
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I just put a new drive shaft on the rear and all the angels are good iv checked that the reason im guess it the slip york is cause when i push on the front drive shaft it move in that spot
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Old 11-10-2013, 09:26 PM   #10
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Take the front shaft out and drive it. If the vibes are gone, that's the problem. If it still has vibes, put the front shaft back in and remove the rear(then put it in 4wd hi) If the vibes are gone, the rear shaft is the problem. If they are still there, its something with the tires, suspension, or tcase. Take a picture of what you are referring to when you said packing new grease. A picture of what you think is wrong will help you more then anything. Punctuation will help us
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Old 11-10-2013, 11:00 PM   #11
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Quote:
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I was wondering because it has happened. Im still dicking around with it. Only thing that was changed was 3" rear lift, and mml. Mml caused worse vibes then without. Took the 3" out and put stock rear with 2" spacers back in. Still worse then before. I had no vibes with stock rear+spacers, and slight vibes with the 2" bds rear(which a 1/4" tc drop fixed). Im worried my output shaft got bent when I drooped with 3" rear and 1" tc drop

best way to get rid of vibes is an sye/cv/adjustable control arm combo

post up a pic of your rear angle ... front is likey not the issue(already uses a cv style shaft)

I highly doubt you bent your output shaft ... think about it .. that's like fully drooping with only 2" of lift ... and with factory arms your not drooping anymore than you would with no
lift EDIT : just read your sig ... still don't think you bent your output shaft ... even with aftermarket control arms
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Old 11-10-2013, 11:04 PM   #12
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Jerry, say the vibes are still there, even after pulling the shafts individually. And swapping tires around changes nothing. What could that be?
you could have a bad unit bearing, bad ujoints .... multiple tires out of balance .... you could be running swampers :P .... etc

next step in my mind would be to have the tires rebalanced
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Old 11-11-2013, 07:01 AM   #13
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Ok ill take a few pics after work but all together in the past 2 weeks iv replaced the rear drive shaft, all new suspension, new steering rack, new wheel bearing, and iv had a proper alignment and had the axle angle adjusted to be aligned with the drive shafts
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Old 11-11-2013, 07:09 AM   #14
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How much lift are you running? Might be time to get a cv rear shaft
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Old 11-11-2013, 08:25 AM   #15
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How much lift are you running? Might be time to get a cv rear shaft
A 4" lift and i already have a sye and extended shaft
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Old 11-11-2013, 09:29 AM   #16
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Old 11-11-2013, 10:09 AM   #17
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I have an 04 Rubicon. After installing RE 3.5" lift had a rear drive-line vibration that we could not get rid of...tried everything under the sun but vibration still there. I was working with a shop that had installed hundreds of lifts and never had a situation like this they could not fix, except for mine.

Months later the owner of the shop called me after he ran into the same problem with a few other Rubicons. It seems that on some of the early Rubicons (mine is an 04 built in 03) the output shaft on the transfer case was causing the problem. Something to do with the bearing not installed correctly causing the output shaft to bind a little during rotation...causing the vibration felt while driving.

The way to check for this is to disconnect the rear drive-shaft, start the rig and put it in gear and look at the output shaft as its spinning. It should be spinning straight and true, but if it has an oblong type rotation then you have the same problem mine had.

Not sure how it was fixed as my shop did the work. There is more to it then just replacing the bearing as it has something to do with the bearing binding inside the case. It was a fairly easy fix for them once they figured out what it was. Here's a link to the shop that figured it out for me, talk to Jeff. Arabia's Overkill Home Page
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Old 11-11-2013, 01:26 PM   #18
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I am curious too,
mine is a oscillating vibration- it is not constant, and not dependent on acceleration, clutching or breaking like a i have experienced with u joints in the past.
Simply as I reach abvout 55-65 mph, it starts, vibrates for 2-3 sec then off for 2-3 then back on, and so on. until I am out of that speed range.
I have had my lift installed for a year (with a t case drop) with no issues.

I will be pulling the driveshafts upon returning from a work trip
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Old 11-11-2013, 03:19 PM   #19
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That's exactly how mine is. Er..was. I figured it out today.
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Old 11-11-2013, 05:10 PM   #20
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and what was your solution?
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Old 11-11-2013, 05:47 PM   #21
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Long story, but the output was actually at a lower angle then the pinion.
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Old 11-11-2013, 06:14 PM   #22
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Heres the pics of my drive shafts
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Old 11-11-2013, 06:29 PM   #23
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Heres the pics of my drive shafts
Did you ever try driving it without the front drive shaft connected? All you have to do is disconnect the axle end, throw some tape around the u-joint caps, and wire the end of it up out of the way. You don't need to disconnect the transfer case end. While you have it disconnected, turn it by hand to see if you have any rough feeling u-joints.
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Old 11-11-2013, 06:31 PM   #24
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Did you ever try driving it without the front drive shaft connected? All you have to do is disconnect the axle end, throw some tape around the u-joint caps, and wire the end of it up out of the way. You don't need to disconnect the transfer case end. While you have it disconnected, turn it by hand to see if you have any rough feeling u-joints.
Iv check my joints that all felt good cause i did have the drive shaft out just didnt drive with out it
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Old 11-11-2013, 06:48 PM   #25
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Iv check my joints that all felt good cause i did have the drive shaft out just didnt drive with out it
Drive it with it disconnected. If the vibes are still there, it's not the front drive shaft. If it's not, it pretty well confirms it is.
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Old 11-12-2013, 03:38 PM   #26
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Hard to really tell with the pinion turned like that, but the pinion angle looks just a little low
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Old 11-12-2013, 04:05 PM   #27
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Heres the pics of my drive shafts
Perhaps it's an optical illusion but the rear u- joint in your second picture in post #22 looks like it is absolute toast. To my eyes, it seems like there is something like a 30 degree angle between the yoke and trunion (body) of the u-joint.
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Old 11-12-2013, 05:21 PM   #28
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Perhaps it's an optical illusion but the rear u- joint in your second picture in post #22 looks like it is absolute toast. To my eyes, it seems like there is something like a 30 degree angle between the yoke and trunion (body) of the u-joint.
Looks bad to me also, but I think that's the front shaft, if we're talking about this one.
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Old 11-12-2013, 05:59 PM   #29
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I bet that's the problem. It shouldn't look twisted. Check the yoke for damage while its off. I've had one of the little centering lips break off and I constantly ate ujoints until I got a new yoke
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Old 11-12-2013, 08:13 PM   #30
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Looks bad to me also, but I think that's the front shaft, if we're talking about this one.
Yep you're right, I can see it's the front shaft now that I'm not trying to see it with my cellphone.

That driveshaft spins 100% of the time and that issue can be the cause of vibrations.

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