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Discussion Starter · #1 ·
Although I don't plan on switching out the rear drive shaft anytime soon, I would like to plan for it in the future. I have questions about what parts are required to be swapped out when installing a double cardan shaft.

I currently have Rokmen control arms with rubber on one side and johnny joints on the other. I assume I would need new rear upper control arms due to length needed for the DC shaft. If I have to purchase new uppers arms, can I run johnny joints on both ends on the uppers and be okay with the other arms only having johnny joints on one end?

My other question is about the rear track bar. I currently have a JKS adjustable rear track bar. Do I have to replace my current track bar for one designed for a DC shaft?

Is there anything else I need to account for?
 

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Jeepless in PA
06 rubi
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Steve578 said:
Although I don't plan on switching out the rear drive shaft anytime soon, I would like to plan for it in the future. I have questions about what parts are required to be swapped out when installing a double cardan shaft.

I currently have Rokmen control arms with rubber on one side and johnny joints on the other. I assume I would need new rear upper control arms due to length needed for the DC shaft.
Why? If the arm is adjustable, you can dial in the rear pinion to the CV. At most, the upper control will change about 1/4" longer from a non-cv to a cv type shaft or you can adjust both upper and lower for even less of a change.



If I have to purchase new uppers arms, can I run johnny joints on both ends on the uppers and be okay with the other arms only having johnny joints on one end?
Yes.

My other question is about the rear track bar. I currently have a JKS adjustable rear track bar. Do I have to replace my current track bar for one designed for a DC shaft?

No, a track bar is a trackbar is a trackbar. It does not matter which you use.

[quote:2wbbb2b9]Is there anything else I need to account for?
[/quote:2wbbb2b9]
No. :)
 

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Discussion Starter · #3 ·
gregert12 said:
Steve578 said:
I assume I would need new rear upper control arms due to length needed for the DC shaft.
Why? If the arm is adjustable, you can dial in the rear pinion to the CV. At most, the upper control will change about 1/4" longer from a non-cv to a cv type shaft or you can adjust both upper and lower for even less of a change.
Rokmen has a regular control arm and a CV control arm. When I originally bought the control arms, Dave mentioned that the CV arms were longer to accommodate the longer length required.

gregert12 said:
Steve578 said:
My other question is about the rear track bar. I currently have a JKS adjustable rear track bar. Do I have to replace my current track bar for one designed for a DC shaft?
No, a track bar is a trackbar is a trackbar. It does not matter which you use.
JKS's website lists two different style track bars. One has a notation stating it has to be used with a single cardan and the other states it must be used with a double cardan. Also, the double cardan style comes with bracket.
 

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The DC shaft is to help with the pinion angle after you lift your jeep so many inches...usually you can get away with running a stock d/s up to about 3-4".

Your current adjustable control arms should be just fine, as long as you can adjust them in order to correct the pinion angle.

The two track bars you are referencing are most likely the same.. But, one uses a track bar bracket that is angled which allows the track bar to not bind when the rear pinion is angled up, normally when going over 3-4" of lift and using a DC rear driveshaft.
 

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Jeepless in PA
06 rubi
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Steve578 said:
Rokmen has a regular control arm and a CV control arm. When I originally bought the control arms, Dave mentioned that the CV arms were longer to accommodate the longer length required.
If you have to, you can adjust both arms in while you set the pinion angle.

Steve578 said:
JKS's website lists two different style track bars. One has a notation stating it has to be used with a single cardan and the other states it must be used with a double cardan. Also, the double cardan style comes with bracket.
No idea, it should still work. Nothing to lose by trying.
 

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JKS adjustable rear track bars for normal driveshafts and CV driveshafts are slightly different.
The gold end that is adjusted (axle end) has slightly more bend in it on the CV version.
The regular one would probably work. I'm pretty sure the TB relo brackets are different as well.
 
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