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Old 05-13-2011, 08:35 AM   #1
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Transfer case vibration

05 LJ. 6 " long arm lift. 488 gears. I have a vibration in my drive line. I have rebuilt both d shafts. Checked both diffs. Pinion angle is ok. Tom wood Ds.

Here is the thing. At highway speeds I have a bad vibration. You can feel it thru the entire jeep. It goes away if I shift into 4 high. I mean completely disappears. When I shift back out it comes back.

What would cause this?

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Old 05-13-2011, 08:42 AM   #2
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Sounds like front DS slack. U-joint maybe? Or it could be the T-case mount. I'm just spit balling here.

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Old 05-13-2011, 03:38 PM   #3
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All new ujoints and center ball.
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Old 05-11-2012, 08:24 PM   #4
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Did you ever figure this out? I'm currently having the same issue with a 2006 TJ rubicon. Vibes at around 45MPH, put it in 4HI and the vibes go away put it back in 2 WD and and soon after there is a shudder and the vibes come back?

I currently have 2 new drive shafts, new transmission mounts and new axle bearings. Seems transfer case related?
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Old 05-12-2012, 10:53 AM   #5
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I never have figured it out. It's aggravating. I will eventually change it out for a different case.
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Old 05-12-2012, 12:32 PM   #6
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I found 2 different posts on different forums. 1 guy had 3 retaining clips broken and synchro gears broken but he had grinding as well and the other had just the pads on the shift fork worn or missing. Both were able like us to shift into 4H and out and make it go away. I'm not sure if I'm going to open it up myself or bring it to the dealer but either way I'll have something on it soon.
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Old 01-14-2013, 10:04 PM   #7
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Ok, I finally got to the bottom of it. It is the synchro hub gear on the transfer case output shaft. Its worn on the splines and wobbling on the output shaft and causing the vibration. putting it in 4H locks the hub gear to the front shaft output causing the wobble to stop. I pulled my x-fer case apart and found this to be the issue, new hub gear was 55.00 from the dealer......so if you can find someone to take the case apart and install the new gear it's a cheap fix that will have you cruising smooth again!
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Old 01-16-2013, 08:44 PM   #8
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For the 2003 to 2006 rubicon the part # is 5080504-AA HUB SYNCH 21014006
$59.10

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