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Unread 12-20-2013, 04:34 PM   #1
Shooter878
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Vibration

First time I had the Jeep on the Highway. Feeling a vibration starting about 48 MPH up to about 55mph. Kept it there so I don't know how high it stays at. Thingking U-joints? Kind of ruled out Front End doesn't feel like out of ADJ or balance vib. you can feel it thru the whole jeep, let off the gas and it real go away about 45-40 mph. Any checks or ideas?

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Unread 12-20-2013, 04:40 PM   #2
Jeffro06
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Check your rear u-joints first, if they'e the originals I'd say they're probably shot.
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Unread 12-21-2013, 12:51 PM   #3
Shooter878
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vibration

Ok How do you know whats org.or not, and while checking the fronts I noticed the drv. shaft doesn't free spin when the tranfer and trans are in neutral, is that right, this is an automatic. the older one would free spin if they weren't in 4w.
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Unread 12-21-2013, 01:40 PM   #4
durango-bob
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Quote:
Originally Posted by Shooter878 View Post
Ok How do you know whats org.or not, and while checking the fronts I noticed the drv. shaft doesn't free spin when the tranfer and trans are in neutral, is that right, this is an automatic. the older one would free spin if they weren't in 4w.
Are the front wheels off the ground?
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Unread 12-21-2013, 02:09 PM   #5
Shooter878
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Vibration

Yes I know if both wheels were off the ground the shaft would turn, on the older jeeps in 2wd the ft shaft spin free, is that not so anymore.
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Unread 12-21-2013, 02:47 PM   #6
durango-bob
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Not without hubs that can unlock. Stock newer Jeeps do not have these.
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Unread 12-21-2013, 08:06 PM   #7
Shooter878
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so your saying all wheels drive all the time no matter what the transfer is in ,2wd or 4wd. I'm confused.
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Unread 12-23-2013, 10:29 AM   #8
Jonny Jeep
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I had a vibe with my old 33" MTRs which started just above 50. Turns out it was a bad tyre. I'd got a slit in one of the sidewall treads and it eventually got worse, going flat 5 mins after getting off the motorway near work. With a full set of new tyres there was no vibe at all. If the tyres are recently balanced and the spare is the same size it might be worth swapping the spare on, and swapping the tyres one at a time to see if any one tyre being removed stops the vibe.

Removing front/rear driveshafts one at a time would identify or rule out them as a cause. If one of them does turn out to be the cause it's most likely UJs but could be a balance issue.

I know the XJ and YJ are different to the TJ but in the XJ/YJ FSM there's a vibration diagnosis section in the wheel and tyre section. Go to the online FSMs in my sig and select cherokee, 93, wheels and tires. It might help, it might not.
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Unread 12-23-2013, 09:20 PM   #9
Shooter878
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Will the trans fluid leak out if you drive it with the front shaft out? If so is there a way around it leaking out?
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Unread 12-23-2013, 09:22 PM   #10
Jeffro06
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The front shaft comes off with a few bolts, it doesn't slide out of the transfer case.
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Unread 12-23-2013, 09:43 PM   #11
adknouse1
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I drive an 03 tj with manual tranny, from my experience your front shaft should rotate freely if the tcase is in neutral as long as the front wheels are off the ground. If yours isn't rotating in this condition it sounds like you have a problem with your tcase/ linkage not disengaging 4wd. Could cause you some vibes at a high enough speed if your locked in 4wd. U joints would be the likely culprit but I would ensure your DS rotates while tcase is in neutral.
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Unread 12-24-2013, 07:52 AM   #12
biffgnar
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Quote:
Originally Posted by Shooter878 View Post
so your saying all wheels drive all the time no matter what the transfer is in ,2wd or 4wd. I'm confused.
Not all wheel drive. No drive is being transmitted to the wheels through the TC in 2WD, but since you don't have locking hubs the driveshaft will spin driven by the wheels.
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Unread 12-24-2013, 07:53 AM   #13
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Quote:
Originally Posted by Shooter878 View Post
Will the trans fluid leak out if you drive it with the front shaft out? If so is there a way around it leaking out?
As stated, no slip yoke in the front, but for TJs even with the slip yoke in the rear you can remove the shaft without leaking fluid. An internal seal was added to the 231s in the 96/97 time frame.
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Unread 12-24-2013, 05:38 PM   #14
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Quote:
Originally Posted by biffgnar View Post
As stated, no slip yoke in the front, but for TJs even with the slip yoke in the rear you can remove the shaft without leaking fluid. An internal seal was added to the 231s in the 96/97 time frame.
Having played around with a few transfer cases, IIRC the 1995 Wrangler NP231 may also have that internal rear driveshaft seal?...
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Unread 12-27-2013, 07:22 PM   #15
Shooter878
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ok guys you guys gave good info, i'll check it again, I didn't have both wheels off the ground only 1 but i will jack them up and make sure it's free, I understand w/o hubs the wheels will turn it, and I really don't think she's in gear. I checked the tire pressure and they were @ 27 psi the sticker on the door frame says 33psi 30x9.50R15LT, thought they were 31's, so I brought it up to 33 psi and VIB. wasn't as bad and the side to side wander didn't seem to be there, you didn't have to keep streering it back either. also going to check toe-in & toe-out and have the balance checked. How do you have to do to put hubs on it, I'm getting prices of 2 to 300 $ and you have to change the whole hub assy. M-38A1's all you did was remove the solid hub end cap and put on the warns.
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