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Old 11-14-2015, 09:48 AM
Thread Starter
Join Date: Oct 2014
Posts: 93
Noise and vibration

Hey guys been working on a problem for a while now.
I have an 04 TJ 5 speed manual 3.25" lift with 33x12.5.
At about 30mph (on the speedometer) the vibration starts. It continues as i speed up but soften at higher speeds. Also the second i let off the gas the vibration stops.
I dont know if this is part of it, but when it running in neutral and i let the clutch out it makes a noise as soon as i puch the clutch in it stops.
I have checked all the u-joints and they seems solid, but i reada thread were someone had changed a u-joint that seemed good and it solved his issue.
Any thoughts?

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Old 11-14-2015, 11:38 AM   #2
Join Date: Apr 2013
Posts: 13,017
Try removing rear drive shaft and a short gent all drive up to speed with problems in 4hi

If it goes away you know problem is in rear shaft or axle assembly

While driveshaft put flex each u joint fully back and forth each direction and feel for clunk or bind

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Old 11-14-2015, 03:27 PM   #3
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Join Date: Oct 2011
Location: Oregon City, OR
Posts: 8,397
A Ujoint can "feel" solid, but it still can be bad if all the needle bearings are dry/seized.
'99 Chili Pepper TJ - I4 PowerTech motor
33x12.5 DuraTracs
Zone 4.25"
F8.8/Artec Rear
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Old 11-16-2015, 10:13 AM
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Join Date: Oct 2014
Posts: 93
That worked, changed 4 or the 5 u-joins and the vibration is gone. Gonna change the u-joins i the front axle next weekend. Im sure they're just as bad.
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