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Old 10-16-2011, 07:40 PM   #1
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4" lift problems

Hello all I have an 05 wrangler rocky mountain edition, inline 6, 6 speed, 4x4, soft top all that, anyways to the point, I just finished putting a rough country N2.0 4" lift on her with the SYE kit with it, and CV rear shaft. The thing is that I have vibrations coming from the rear and don't know why. I thought that with a SYE I wouldn't have the vibrations, but I can live with em please help!!!

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Old 10-16-2011, 07:56 PM   #2
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Post pics of your pinion angle. Was it a new or used shaft, if used it could be out of balance. Is that all you did was lift and sye/cv shaft? No new tires, or a chance a weight could have been knocked off during the instal?

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Old 10-16-2011, 09:00 PM   #3
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Hello I also bought the same lift and I had to buy upper control arms to get a better pinion angle. Now I had to also order shock extensions for the rear to get even more angle because my shocks are too close to the bottom of where my coil sits.
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Old 10-16-2011, 09:03 PM   #4
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I've learned alot from this form. Do a search on measuring your pinion there are alot of helpful info
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Old 10-16-2011, 09:09 PM   #5
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Definitely check your pinion angle. If your RC lift didn't come with rear upper adjustable control arms (at least) you'll need to get some so that you can set your pinion angle correctly. You'll want the pinion to be about in-line with the driveshaft, possibly a degree lower. If you didn't touch the pinion angle, that is probably where your vibes are coming from.
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Old 10-16-2011, 09:58 PM   #6
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10/4 that'll help me out alot and i have a new cv shaft that I bought with the kit. And also this is my first lift and my first jeep, so I'm kinda new at this stuff I'll order the uppers right now, but would I have to get the front control arms to?
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Old 10-17-2011, 08:39 AM   #7
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You wouldn't "have" to get the front upper CAs, just like you wouldn't "have" to get the rear lower CAs, but in order to get things setup right I definitely think all 8 should be replaced. If you need time to save, just getting the rear uppers will get you by. You should be able to at least adjust the pinion enough so that your problems are gone, and then when you can upgrade the others. I recently got all 8 replaced with the Savvy double adjustable arms and it's a night and day difference from what I had before.
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Old 10-17-2011, 08:54 AM   #8
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did you also drop your transfer case? and, did you also use all brand new u-joints in your setup?
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Old 10-17-2011, 04:14 PM   #9
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No I haven't got wheels and tires for her yet but that's in the wrks. Possibly 33s and no I did not drop the trans. that's the whole reason I got the SYE and it came with a new CV shaft for the rear but I figured I'd put new ujoints in the front shaft while it was out anyways.

Update on adj. upper CAs
Went ahead and ordered em for the front and rear from RC, and their fully greaseable and rebuildable also adjustable just $381 with shipping which is cheaper then the other name brands and looks purty stout. so I'm just goin to have to test em out once I get her all fixed up
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Old 10-17-2011, 05:22 PM   #10
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Originally Posted by Driftrage25 View Post
No I haven't got wheels and tires for her yet but that's in the wrks. Possibly 33s and no I did not drop the trans. that's the whole reason I got the SYE and it came with a new CV shaft for the rear but I figured I'd put new ujoints in the front shaft while it was out anyways.

Update on adj. upper CAs
Went ahead and ordered em for the front and rear from RC, and their fully greaseable and rebuildable also adjustable just $381 with shipping which is cheaper then the other name brands and looks purty stout. so I'm just goin to have to test em out once I get her all fixed up
Should have read up a little more on CA's before making that purchase.
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Old 10-17-2011, 08:15 PM   #11
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Should have read up a little more on CA's before making that purchase.
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Old 10-17-2011, 08:20 PM   #12
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Originally Posted by DevilDogDoc View Post
Should have read up a little more on CA's before making that purchase.

X3 they are not your best choice. just because they look good in a photo dose not mean a thing. Romkin and Clayton use Curry Jonney style joins (currie makes arms as well) and they on a different level over RC in in both the joint and how they are made.
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Old 12-30-2012, 09:53 PM   #13
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Quote:
Originally Posted by TJ-JAM
Hello I also bought the same lift and I had to buy upper control arms to get a better pinion angle. Now I had to also order shock extensions for the rear to get even more angle because my shocks are too close to the bottom of where my coil sits.
Hey at what length did you put you're uppers at front/rear for that lift cause I'm having vibration issues after installing the front driveshaft after not having it in for a year
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Old 12-30-2012, 09:58 PM   #14
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There's no set length all jeeps are diffrent, get a degree finder and measure your pinion angles
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Old 12-30-2012, 10:19 PM   #15
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Originally Posted by TJ-JAM View Post
Hello I also bought the same lift and I had to buy upper control arms to get a better pinion angle. Now I had to also order shock extensions for the rear to get even more angle because my shocks are too close to the bottom of where my coil sits.
You're better off taking a grinder to the coil buckets than running extensions for the shocks. They tend to increase the leverage the shock mount sees and tear the mounts off.
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Old 12-30-2012, 10:22 PM   #16
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There's no set length all jeeps are diffrent, get a degree finder and measure your pinion angles
Even easier, pull the tires off and look at the pinion yoke. If its in line with the driveshaft your good. If not adjust until it is in line or a little lower. Go drive it. If it vibes raise it up and repeat.
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Old 12-31-2012, 10:49 PM   #17
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There's no set length all jeeps are diffrent, get a degree finder and measure your pinion angles
Yes, you are correct! The proper way is to set your pinion angles with a protractor. It is very important to get the same working angle on both joints to eliminate vibration!

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