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Old 11-16-2013, 08:00 AM   #1
MallCrawler

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Axle u-joint and vibrations

I am getting some vibes pretty much at all speeds. My guess is tire balance but I do have a u-joint going south. I can feel a minor clunk and see slight movement in the caps.

Will a axle u-joint cause vibrations? I've heard of binding [turning] and/or noise. I just don't see how a axle u-joint would cause vibes. Correct me if I'm wrong.

Wow... I feel strange posting a question. Been a while


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Old 11-16-2013, 08:09 AM   #2
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LOL saw you posting a question and had to take a look...
In my non-specific, general knowledge, anything loose can cause vibrations, right ? And those vibrations travel through connected parts. Maybe that's just an aircraft thing though...

I had vibrations because my tires were unbalanced, and it only manifested itself between rather specific speeds... usually 50mph +/-3 (I'd assume it's different depending on how out of balance they are/tire size. Just giving 50mph as an example).

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Old 11-16-2013, 08:35 AM   #3
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Is this a new vibration? I can imagine axle u-joints could cause a vibration but I have never of that complaint before on an axle. I know an incorrect pinion angle will cause the driveshaft to vibrate so that may be a source if a lift has recently been installed, the reason I ask if it was a new noise. U-joints are an easy and inexpensive fix so, if you need one replaced don't wait for the impending catastrophic failure.
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Old 11-16-2013, 08:58 AM   #4
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Good points. Always had some minor vibes even with the front DS off. Chalked it up to the tires. Just gotten worse of late.
Bad luck with tire balancing around here so putting that off if I can.
What I plan to do is rotate the tires and see if that helps.

I was just curious if a axle u-joint could actually cause a vibe, rather then I need help diagnosing.

Fwiw, I have new joints just haven't installed yet.
Plans are to regear and will just have them done then. Also a bad axle seal
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Old 11-16-2013, 04:14 PM   #5
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Update:

Rotated left front to rear only and went for a drive. Def smoother at speed. I'll drive a few days this way then try the right side.
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Old 11-16-2013, 04:46 PM   #6
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When a tire is out of balance, it will normally give you a shimmy in the steering wheel, and or hop at speeds of 50 to 65 mph.

Now if it is a bad tire, out of round, then it could cause a issue at any speed.

A continuous vibration is normally engine related or drive train, "shaft out of balance bent/twisted, bad u joint, or input or out put bearings.

Rev your engine in neutral and see if you have the vibration. If you do, the Harmonic balancer, or something loose on your engine, like the alternator mounting can cause it.
If it's smooth in nuetral, then most likely it is drive line related.
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Old 11-16-2013, 05:07 PM   #7
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The vibe was in the steering wheel for sure. Doesn't feel like when I had my caster up to 6* with a 3" lift and double carden
More of a jittery vibe not harmonic.

Think its time for a balance. Just can't find a shop with a competent tech around here. One who is willing to "do what I takes" which means breaking the tire down if need be.

The tires were balanced new. only one tire (spare) showed a small wobble on the machine. Rest spun nice unlike my previous KM2's which were a PIA to balance.

Thank you !!!!!
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Old 11-16-2013, 07:43 PM   #8
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Discount tire Co is headquartered about 10 miles from my home. They have stores all over the Phoenix Metro area.
I have lived in Phx for about 40 years, and have been using them ever since they have been in business, maybe 25 years, I don't remember ex-actually.
They will spend the time that it takes to get it right, and that includes re-positioning the tire to wheel first for the most accurate balance, with the least amount of weights.

They have stores in just about every state. Have you ever looked to see if they have one in your area?
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Old 11-16-2013, 08:04 PM   #9
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There's 1 just over a hour from me.
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Old 11-16-2013, 09:07 PM   #10
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Ok. Just finished my dance with that devil.

3 inch teraflex lift with full 8 arms

Had the the front drive shaft replaced and kept stock in the rear.
35 inch km2

Had vibrations really bad. DT found that I had 3 bad tires. After that I found that my lug centric wheels were not helping- got aev wheels that are hubcentric. I still had a slight vibration well that got removed by lowering my rear pinion angle by 1.5 degrees. Now at 80 no vibs just the norm.

In the beginning DT must have balanced my tires 10 times while finding the bad tires.

Pm me if have any questions. The process took about 6 weeks.
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Old 11-16-2013, 09:25 PM   #11
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Quote:
Originally Posted by kjeeper10 View Post
There's 1 just over a hour from me.
I would for sure say its the tires my friend. I have s slight shimmy an vibe thst comes from the steering wheel an I know for a fact my tires aren't balanced
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Old 11-16-2013, 10:12 PM   #12
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Quote:
Originally Posted by Kevlars View Post
Ok. Just finished my dance with that devil. 3 inch teraflex lift with full 8 arms Had the the front drive shaft replaced and kept stock in the rear. 35 inch km2 Had vibrations really bad. DT found that I had 3 bad tires. After that I found that my lug centric wheels were not helping- got aev wheels that are hubcentric. I still had a slight vibration well that got removed by lowering my rear pinion angle by 1.5 degrees. Now at 80 no vibs just the norm. In the beginning DT must have balanced my tires 10 times while finding the bad tires. Pm me if have any questions. The process took about 6 weeks.
Thanks. Surprised the rear stock shaft was causing vibes. From my understanding they do not. You mean raised the rear or did they have the arms set wrong and your pinion was too high ?
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Old 11-17-2013, 12:49 AM   #13
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Quote:
Originally Posted by kjeeper10 View Post
Thanks. Surprised the rear stock shaft was causing vibes. From my understanding they do not. You mean raised the rear or did they have the arms set wrong and your pinion was too high ?
Well from my research and talking to the Mopar techs the stock drive shaft does not like to be perfectly lined up. It needs some bend, not a lot but some. What caused us to look at that is that the rear trackbar relocation bracket bolt was rubbing on the spring. Now that is not uncommon on Teraflex springs, but looking at that we noticed that the drive shaft was coming directly coming out - I mean dead center. The tech said that it needs a slight bend. Like .5 degrees. So we shortened the upper control arms and it changed the pinion angle by 1.5 degrees. With that the spring platform leveled out some and moved the spring forward missing the bolt.

Got in drove it expecting no change ....but it was much smoother ... Before the change the bolt was not resting on the spring, but it would impact it when compressed.

That's all I got....1 tires (out of round and not balancing), 2 wheels not being hub centric, 3 rear drive shaft and pinion angle.

-K

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