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Unread 02-04-2012, 07:55 AM   #1
hdrocknroll
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U joint, phasing, marking parts, vibration???

I just replaced both front wheel axle. U joints. The other day, one bad one real bad, but now I still have a slight vibration but nothing like it was with the bad U joints.
Before I took these apart. I marked both parts with a grease pencil so I could put them back together the same way, but the second one I did, the Mark got erased on one part, so I don't know if I put it back together the same way or not. Could this be the reason for this different vibration? Is it worth the trouble to take it apart turn it 90° and reassemble?
What do you think?

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Unread 02-04-2012, 09:19 AM   #2
Foundrydude
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Phasing should not matter. I would look at the joints double close to be sure you got the clips seated and one of the caps isn't loose.

Otherwise I would say by solving the larger vibration you can now notice a smaller one. Perhaps the worn U joints trashed a wheel bearing, track bar bushing, etc. How do the driveshaft U joints look? I'd at least pull the shaft and inspect the joints properly if you haven't already replaced em.

Could be as simple as an out of balance tire, kinda depends on the frequency of the vibration and when exactly it's happening

good luck
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Unread 02-04-2012, 10:16 AM   #3
hdrocknroll
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Quote:
Originally Posted by Foundrydude View Post
Phasing should not matter. I would look at the joints double close to be sure you got the clips seated and one of the caps isn't loose.

Otherwise I would say by solving the larger vibration you can now notice a smaller one. Perhaps the worn U joints trashed a wheel bearing, track bar bushing, etc. How do the driveshaft U joints look? I'd at least pull the shaft and inspect the joints properly if you haven't already replaced em.

Could be as simple as an out of balance tire, kinda depends on the frequency of the vibration and when exactly it's happening

good luck
thanks for your reply.
I was thinking that maybe I unmasked another vibration.
I did a quick check on the other you joints before.
My tires were just put on and balanced at discount tire.
From what I could tell there was nothing wrong with the bearing assemblies no play or anything.
I'm going out there today to replace steering damper because it was leaking, so I will check out some things further.
I was looking at replacing all the U joints, I can get five of these Neapco Universal Joint at advanced auto with a coupon code for $42, but then again that's just throwing parts at it. Most things on this Jeep have been neglected.
Thanks again. I value your opinion
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Unread 02-04-2012, 10:55 AM   #4
hdrocknroll
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Well I'll be darned one end of one clip is not seated properly
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Unread 02-04-2012, 12:40 PM   #5
Foundrydude
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Just to clarify.........If it's just a mis-set clip, that won't make it vibrate. But if the clip's not in the groove cause one cap needs to be set a smidge deeper before the clip will seat, then the joint will vibrate. Hope that makes sense. It's all about cap position.

good luck with it
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Unread 02-04-2012, 12:55 PM   #6
hdrocknroll
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I understand, I still need to set the clip right.
Got damper on ,came in to check torque specs.
Checking other U joints thoroughly later
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Unread 02-04-2012, 04:42 PM   #7
hdrocknroll
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I took the axle back out where the clip was messed up. I had one end to far to rear. Pushed the cups out and put them back.
Put it all back together all the other U joints look good and I can't get any movement out of any of them side to side movement at the yolks is only slight, turning back and forth I get less than a quarter of an inch of slop.
But I still have this slight vibration.
Couldn't get any play out of the ball joints, or the steering connections, but the hubs on this thing look like they're about a million years old.
I don't even know what to look for next. Except pull the other shafts off , didn't do that today
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Unread 02-04-2012, 05:11 PM   #8
hdrocknroll
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Any one else got any ideas ?
The vibration feels like I'm driving on little rocks spread out on cement.
Cant even feel it till you get to about 40.
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Unread 02-05-2012, 05:21 PM   #9
hdrocknroll
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Ordered a pair of Timken hubs last night from car parts wholesale.com, $137.00 shipped because ,like I said, the hubs look like there are a million years old and I have read that it can be very hard to tell if a bearing is bad.
I decided to do the valve cover gasket today so I didn't pull any drive shafts off yet.
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Unread 02-05-2012, 10:03 PM   #10
4Slow9erHybrid
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Worn spider gears can cause a slight vibration too.
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Unread 05-28-2012, 04:56 PM   #11
4Slow9erHybrid
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Quote:
Originally Posted by hdrocknroll View Post
Ordered a pair of Timken hubs last night from car parts wholesale.com, $137.00 shipped because ,like I said, the hubs look like there are a million years old and I have read that it can be very hard to tell if a bearing is bad.
I decided to do the valve cover gasket today so I didn't pull any drive shafts off yet.
Did the new hubs fix your slight vibration? I have something similar. Can't figure out what is causing it.
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Unread 05-28-2012, 05:11 PM   #12
hdrocknroll
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Quote:
Originally Posted by 4Slow9erHybrid View Post
Did the new hubs fix your slight vibration? I have something similar. Can't figure out what is causing it.
It was not the hubs causing the vibration.
FT drive shaft center yoke, but was not repairable, got another DS at JY.

See here
Quick ,Double Cardan U joint Ball Spring????????

And here
Double Cardan U joint ,is this going to work ???
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Unread 05-28-2012, 07:34 PM   #13
4Slow9erHybrid
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Quote:
Originally Posted by hdrocknroll View Post
It was not the hubs causing the vibration.
FT drive shaft center yoke, but was not repairable, got another DS at JY.

See here
Quick ,Double Cardan U joint Ball Spring????????

And here
Double Cardan U joint ,is this going to work ???
The slight vibration you had, was it a mechanical (low frequency, eg. steering shimmy) or audible?

I my case I have a slight steering shimmy, even without the front DS connected. If I put the DS in, it also adds an audible vibration.
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Unread 05-28-2012, 11:43 PM   #14
hdrocknroll
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The vibration wasn't really audible.
Before I replaced the front axle U joints, I could feel it in the steering, after that I could feel it pretty much in the whole Jeep.
You may have a bad wheel hub, or maybe your rear driveshaft U joints.
So maybe you could have your front driveshaft in, and take your rear driveshaft out and see what you get.
Or maybe your tires are not balanced properly.
Or maybe you got your sub turned up too far
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Unread 05-29-2012, 09:06 AM   #15
4Slow9erHybrid
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Quote:
Originally Posted by hdrocknroll View Post
The vibration wasn't really audible.
Before I replaced the front axle U joints, I could feel it in the steering, after that I could feel it pretty much in the whole Jeep.
You may have a bad wheel hub, or maybe your rear driveshaft U joints.
So maybe you could have your front driveshaft in, and take your rear driveshaft out and see what you get.
Or maybe your tires are not balanced properly.
Or maybe you got your sub turned up too far
Thanks for the suggestions, I already went through all these steps trying to find the faulty component.

1) Rear DS u-joints replaced with Spicer ones, DS balanced at a shop. I still had vibrations even after that. Turned out eventually to have a slightly excessive runout at the pinion yoke. I don't trust the shop that did the balancing though as they bent the yoke at the slip yoke end (used a BFH to replace the u-joint, I can see the marks). Anyway, I was able to fix that myself. Now there're no noticeable vibes from the rear DS. I'm 99% positive it's not the culprit. The shop also rebalanced the front DS and said it was "smooth as butter".

2) I have 2 set of tires recently balanced at two different shops, swapping or rotating them makes no difference. I think we can safely eliminate this possibility.

3) I tried with only the front DS in, vibes were bad. But at that time I had a loose front output yoke in the TC.

Since then I rebuilt the TC, both diffs (new bearings and seals, bearing preloads adjusted, gear patterns good).

4) Hubs, it's a possibility, but not likely. Removing the front DS gets rid of 95% of vibrations and noise. Also the vibrations start at ~ 35mph and get worse with speed, not affected by accel/decel much. Hubs usually don't cause a vibration at low speeds. Also no play in them, or any roughness I could feel when I had them out. They are original though. Jeep has only 96K. Brand new spicer u-joints in the front axleshafts.

I'm suspecting the front DS, the double cardan CV joint is original. I'll be really pissed if that is the case as it was checked out and rebalanced by the driveline "specialists". I really hate all the incompetent "specialists". Ok, rant off.
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