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Front upper adjustable control arms

679 views 4 replies 2 participants last post by  Reblrubicon 
#1 ·
Has anyone needed FRONT upper adjustable control arms to correct pinion angle? If so wondering what size lift do you have? I have a 4.0 TJ manual Rubi, 3.5 inch lift with CV shaft and rear upper adjustable control arms with the pinion angle set at zero, no T case drop. Slight tollirable pulsing vibes at 65+ but looking to correct it. Tires are balanced perfectly and CV joint & U-joint are good on the factory front shaft
 
#2 ·
Not to be obnoxious or a PITA; but why are you needing upper adjustable CA's on the front axel in lieu of lower adjustable CA's?
The pinion angle can still be adjusted and with either, but IMHO there is something other than pinion angle causing your issue.
 
#3 ·
I have Aftermarket lower short arms already. Front uppers are all that's stock, figured if an adjustable was necessary id finally change the uppers. Basically I'm looking to see how common it's required to set front pinion to 0 and at what lift amount it's necessary, maybe the front has a tolerance?
 
#4 ·
If you have scanned my profile you can see the mods that have been done on my Jeep, and I also had vibes in the front but with further inspection I found a Very Slight Bow, in my front driveshaft, not noticeable till it was removed from underneath.
 
#5 ·
I had the driveshaft out Monday that is when I found the frozen u- joint. Rolled the center section between the joints on my bench and it seemed strait. I just picked this TJ up 3 weeks ago and finally got all the bugs out of it besides this, I have always used YJs. The previous owner was a street queen so this things never seen a trail yet.
 
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