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Old 10-21-2011, 06:42 AM   #1
Jeeper
 
Join Date: Jul 2011
Posts: 30
Pinion angle

Hello,
I just took my TJ to the drive shaft shop to see if they can figure out why I get a floor board vibration @ 2200rpm 60-65mph in 5th gear ( 4th gear at that rpm also but not as bad). All motor and transmission mounts are ok. He replaced the the U joints and balanced the rear drive shaft but the vibration is still there. He came to the conclusion that the pinion angle of drive shaft to differential is about straight and should be about 3 degrees. The Jeep is a 2004 and I just purchased it, it has never been lifted that we can tell and everything is stock. My question to the forum is from Danny the owner of the drive shaft shop, does Mopar make upper control arms in the rear end that are adjustable? Danny was talking about experimenting and making adjustments himself to shorten the upper control arms so the pinion angle would be correct and hoping that the vibration would be corrected(when there is torque at that speed the pinion angle would be correct and and no vibration to speak of). Any input from the forum would be appreciated.
George

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Old 10-21-2011, 06:52 AM   #2
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Join Date: Jan 2009
Location: NE Ohio
Posts: 1,708
You would have to or be better off getting after market Adjustables.

Just out of curiosity, did you also check the front driveshaft u-joints to eliminate those from the equation as well....

Does the rear pinion yoke have any play in it, as in up or down play would indicate a bearing.

Also check the pinion Yoke, check the cast ears (little tabs) that hold the Ujoint side-to-side movement, to make sure not worn are broke to cause the rear DS joint to slide around in the pinion yoke.
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