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Old 04-10-2009, 05:50 PM   #1
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Upper Control Arms - SYE - Drive shaft

Closing in on a lift kit. TIme to make the last question. I have noticed is that a lot of kits recommend a slip yoke eliminator and a CV drive shaft upgrade and many suggest the upper control arms too. Is this needed? Do you guys have it... is it a true concern. Did you notice a drastic difference when you upgraded? My take is that it can not truelly be essential or someone somewhere would put them in more of their kits but few do (the 4.5 RE Super Flex has them)! Am I right or wrong? Thanks alot. The dream is closing in...

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Old 04-10-2009, 06:07 PM   #2
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The real reason for needing the adjustable upper arms is to properly set your rear axle's pinion angle. This is what gets rid of the vibes from the angle of the driveshaft.

As far as needing them, it's a much wiser investment than dropping the transfercase (cheaper more incomplete kits usually come with t-case drops) an inch or two... which is what you installed the lift for, ground clearance.

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Old 04-10-2009, 07:15 PM   #3
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I would say yes. I installed my lift with the transfer case drop and a MML whick also helps a little, but the vibration is horrible.
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Old 04-10-2009, 09:29 PM   #4
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IF you install a SYE + CV Rear Driveshaft, you MUST install adjustable rear upper control arms to set the pinion angle. If you don't, you will have problems with the expensive driveshaft upgrade you just installed.

And YES - SYE + CV Driveshaft is definitely worth the upgrade.
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Old 04-10-2009, 09:45 PM   #5
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Originally Posted by markhuntsville View Post
IF you install a SYE + CV Rear Driveshaft, you MUST install adjustable rear upper control arms to set the pinion angle. If you don't, you will have problems with the expensive driveshaft upgrade you just installed.

And YES - SYE + CV Driveshaft is definitely worth the upgrade.

You know, everyone says this, however, the Rubi comes with a transfer case that doesn't require a SYE/driveshaft upgrade, yet it doesn't have adjustable control arms. Are the control arms on a Rubi different from those on a non-Rubi? That would make sense, but is that the case?

I don't have part numbers for the control arms on a Rubi, nor do I have the numbers for the control arms on a non-Rubi. I guess that would be a start to see if there is a difference between the two.

I'm just curious. I've wondered about this before, but forgot it until this post.
Does anyone know?
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Old 04-10-2009, 10:10 PM   #6
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The Rubicon has a convetional 2 joint driveshaft and no CV driveshaft. If you have a big lift on a Rubicon and you need a CV drveshaft for that angles you also need to adjust the angle of the rear axle.



Pics from www.4xshaft.com
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Old 04-10-2009, 10:19 PM   #7
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The Rubicon has a convetional 2 joint driveshaft and no CV driveshaft. If you have a big lift on a Rubicon and you need a CV drveshaft for that angles you also need to adjust the angle of the rear axle.



Pics from www.4xshaft.com

Now it makes sense. I thought they had a CV style DS. Thanks for clearing that up for me. And thanks for the diagram, it helps explain things better for me.
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Old 04-11-2009, 01:34 AM   #8
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I think what happens is the Rubicon Transfer case is shorter then the Np231. This means it wont be effected as much ans a regular TJ when it comes to drive shaft angles. But yes nicolas is right even in a Rubicon you will need a CV driveshaft eventually.
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Old 04-11-2009, 01:41 AM   #9
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I think what happens is the Rubicon Transfer case is shorter then the Np231. This means it wont be effected as much ans a regular TJ when it comes to drive shaft angles. But yes nicolas is right even in a Rubicon you will need a CV driveshaft eventually.
I was aware of the shorter tc, I was confused because I thought the Rubicons came with a CV style DS. Now I know
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Old 04-11-2009, 01:57 AM   #10
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and knowing is half the battle......
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Old 04-11-2009, 10:52 AM   #11
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The confusion probably stems from the Rubi doesn't need a SYE - it already has the slip joint in the shaft.

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