Diagnosis? - JeepForum.com
 
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post #1 of 10 Old 12-07-2014, 11:11 AM Thread Starter
orangeafroman
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Diagnosis?

Minor rattling/vibration above 60 mph. Vibration is not in steering wheel, but down by gear shifter/ center of vehicle.

My auto shop said I need new ball joints, but not urgent. It's the next thing I'll get done. They said this generally, I didn't bring it in for the vibration.

I'm just scared/paranoid that it's a front diff/transfer case/tranny issue causing the vibration. I've literally had a front drive shaft fall off onto the highway in the past, so I'm paranoid.

Can anyone say due to the vibration only happening over a certain speed that it's def the ball joints and I can relax? The wheels have been balanced , all new tie rods and track bar, will have it aligned once the ball joints are replaced...anyone able to diagnose this?

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post #2 of 10 Old 12-07-2014, 01:42 PM
durango-bob
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Check the front driveshaft joints. Worn joints can cause the symptoms you have.
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post #3 of 10 Old 12-07-2014, 01:43 PM
coralman
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It could be so many things its gonna be hard to say any one thing. Not a 4 wheel guy, but your best bet is to educate yourself a bit on your jeep and do some reading on drivetrain and suspension. I honestly don't think anyone can assure you that its the ball joints. Get under there and check the front driveshaft for play or looseness. Could be the front axles or a host of things. If you don't want to go through all that take it back to the shop for the vibration. Not trying to dis you, just being honest.

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post #4 of 10 Old 12-07-2014, 02:31 PM Thread Starter
orangeafroman
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I live 2 hours from a shop, so I can't just easily take it in whenever. Just looking for ideas.

If it's the driveshaft joints, do they need to be greased or something? I replaced them within the last couple of years.
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post #5 of 10 Old 12-08-2014, 06:14 PM Thread Starter
orangeafroman
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I got it to a shop and they'll check it tomorrow. Will post update.
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post #6 of 10 Old 01-04-2015, 08:37 AM Thread Starter
orangeafroman
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I know it could be many things, but with the evidence, I'm sure someone can pinpoint the culprit of the vibrating middle/front:

only happens 65+, smooth as silk under that
when the front drive shaft is removed, it doesn't vibrate (according to the shop)
vibrations are worse when coming down a mountain, coasting
the ball joints need replacing (so they may be the whole problem)
I drove hundreds of miles with the issue, so I don't feel like my drive shaft is going to fall out again
I changed the sway bar bushings out, but doesn't seem right. I believe the sway bar is non-essential, so I hope that's not causing it.

I'm just scared it's a transfer case/tranny issue or front diff issue. The front diff was opened and no shavings or anything. Tranny fluid is red and full.
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post #7 of 10 Old 01-04-2015, 11:17 AM
Scrubberguy
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Your shop guy says when the pulled the front DS it stopped the vibriating?

Is this the original DS? it is possible it is bent from having dropped on the road at speed? or is out of balance because of it.

If this has a "sealed" yoke on each end I think I'd pull the front DS and drive it myself for awhile, once convinced this stopped the problem I'd re balance the old shaft or buy a new one, leaning strongly towards a new DS rather than try to fix one that has had issues.

Things that spin fast need to be right all the time ya know!
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post #8 of 10 Old 01-04-2015, 09:57 PM Thread Starter
orangeafroman
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No, definitely not the original one, lol, and they replaced the one that was in it. But the problem is still there.
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post #9 of 10 Old 01-05-2015, 09:48 AM
dirtybobby423
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Just a thought, I had a similar problem with an older Cherokee, and it turned out that my harmonic balancer was going out. There was a piece of rubber or some kind of material inside the balancer that had started to work its way out, and upon inspection you could see it hanging out of the balancer. No idea why it only happened at certain speeds, but easy to check. U-joints and wheel balancing could do it to, like coralman said it could be a lot of things, start with the easy/cheap ones.
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post #10 of 10 Old 01-05-2015, 10:17 AM
kg6mov
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5.2 is internally balanced so the harmonic balancer isn't.


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