Vibration in the Rubicon

[dwcjwerfner]

Under hard acceleration and then at highway speed the Rubi has a pretty good vibration. What is interesting is when you pull it into 4wd at 80k the vibration stops, not just lessens but stops. The only vibration I get then is when I am on the power and back off hard I get the same vibration under compression braking but it fades once the load is off the drive line. The u-joints all looked OK when I put the drive shafts back on, maybe a little stiff so maybe driving it has made that an issue...

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[badcompany]

i have a friend with a yj that had the same problem, turned out to be bad front axle shaft u joints.

 

[dwcjwerfner]

Interesting, I did just change one of the front unit bearings because it was bad and it got rid of part of the vibration or really more a shake. Just took the rear of the shaft off the pinion and the grease in the caps smells burnt. I found my adapter and got grease into it. The front joint on that shaft is factory original, I think I will get 2 new u-joints tomorrow.

 

[Twinkie]

Great, Dwayne's wrenching before an event (that he is organizing no less), he's gonna be late. :flipoff:

 

[dwcjwerfner]

I am always wrenching, not always on my offroad stuff but on something.

 

[chunkytrunks]

Remeber those mis matched upper control arms....
You replace those yet? If its not a ujoint my guess would be that

 

[Buster]

Remeber those mis matched upper control arms....


I'm sure matt has some custom tweaked ones....

 

[chunkytrunks]

That I do have many of!

Remeber those mis matched upper control arms....


I'm sure matt has some custom tweaked ones....

 

[Badweld]

Could it be the rear end torquing and changing the drive line angle? I had that happen with my new SYE in my cherokee.

 

[chunkytrunks]

Thats what im wondering. I know he has kis matched length upper control arms on the rear so im thinking thats the problem.
Matt

Could it be the rear end torquing and changing the drive line angle? I had that happen with my new SYE in my cherokee.

 

[dwcjwerfner]

Hmmm that is interesting, I should get at changing those joints tonight and see what happens.