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Old 03-29-2012, 07:57 AM   #1
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4in RC Lift/SYE/CV D/S Woes

Good morning,

I have been trying to track down this pinion angle problem for a while.

I installed the 4in N2.0 kit, with fixed lowers (front and rear).

I put a SYE and a new drive shaft in. I could not get the pinion angle back to perfect, i tried the cam bolts in the rear. I tried Adj UCA (the fixed lowers wouldn't allow the uppers to adjust it all the way up). I finally settled on a MML and about 1/2in drop on the T/C. I know this tottally defeats the purpose of the SYE/DS set up.

It was all i could do to get rid of the a small vibration I still had. I had the D/S re balance twice.

At this point I have been thinking about possible taking the 4in kit down to 3in or so or once i put front/rear bumpers I think some of the weight will help it settle down some.

Question: Could I swap in 3.5in coils and leave my 4in RC lower conntrol arms and not have problems?

Any thoughts/comments would be appreciated.

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Old 03-29-2012, 08:29 AM   #2
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That's very odd. You are setting the pinion angle level with the drive shaft correct? And did you use the track bar bracket for a cv drive shaft so it won't be at a bind?

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Old 03-29-2012, 08:35 AM   #3
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Yes. Tracbar bracket is on. I set the pinion angle and had local jeep shop check it.

We have gone back and forth. Very frustrating.
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Old 03-29-2012, 09:37 AM   #4
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You need adjustable upper CAs AND lower CAs to properly set the pinion angle.

While I think 3" coils are a better idea anyway, that is not going to fix the problem you have.
Also, rda was asking if you are running a rear trackbar bracket that is designed for use with a CV ds. The standard bracket included in the kit is not ideal for a CV ds as the trackbar will bind when you adjust the pinion.
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Old 03-29-2012, 11:09 AM   #5
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Save you time and head ache, get the rear lower control arms. I had to get upper and lower to dial in the angle.
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Old 03-29-2012, 11:13 AM   #6
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From what I've read about others and my experience with rubicon express a 3.5" spring nets 4-4.25" of lift. I'm not sure the springs will help.
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Old 03-29-2012, 11:39 AM   #7
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Can you point me in the direction for the correct bracket.
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Old 03-29-2012, 11:53 AM   #8
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Old 03-29-2012, 01:17 PM   #9
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that is interseting, i don't think i've ever really noticed a different bracket.

what is the main difference?
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Old 03-29-2012, 01:26 PM   #10
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sucks. i was about to do my SYE/CV this weekend. I have upper and rear Adj CA, but not lower rear or front adj. CA. Maybe i Should wait till i have all of them to d o it.
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Old 03-29-2012, 03:44 PM   #11
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I've got a very similar problem. I installed my zone 4" lift and have since upgrade a control arms to Clayton adj ones. After the SYE and new DS, I've had vibes ever since. I've dialed in my pinion angle many times. Vibes are in worst in 4th gear going about 35-40 mph. I have no idea what I do either.
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Old 03-29-2012, 06:59 PM   #12
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I've got a very similar problem. I installed my zone 4" lift and have since upgrade a control arms to Clayton adj ones. After the SYE and new DS, I've had vibes ever since. I've dialed in my pinion angle many times. Vibes are in worst in 4th gear going about 35-40 mph. I have no idea what I do either.
you have upper and lower adj control arms?
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Old 03-29-2012, 07:45 PM   #13
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Quote:
Originally Posted by htkrph

you have upper and lower adj control arms?
Yessir
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Old 03-29-2012, 08:07 PM   #14
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Yessir
and still getting vibes? i might hold up on my install then.
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Old 03-29-2012, 09:03 PM   #15
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Ya. I might have a bad pinion bearing or something. Really frustrating
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Old 06-04-2012, 02:07 PM   #16
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Ya. I might have a bad pinion bearing or something. Really frustrating

Ever figure it out?
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Old 06-04-2012, 02:43 PM   #17
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Originally Posted by david95xj View Post
that is interseting, i don't think i've ever really noticed a different bracket.

what is the main difference?
The main difference in the rear track bar brackets is obvious when you look at them side by side.

the standard 4" rear track bar bracket is straight and just moves the track bar up in the same orientation as stock

This is RE1603- Standard bracket


This is the RE1602- Angled Rear Bracket



JKS and Currie are the only other companies I know that makes this angled bracket

The angled bracket allows you to use your stock track bar with the SYE.... the standard bracket will NOT allow you rotate the pinion.

You can you either bracket with an adj track bar with a heim or JJ since it can allow for the misalignment issue.
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Old 06-04-2012, 02:46 PM   #18
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Quote:
Originally Posted by TnDz TJ

The main difference in the rear track bar brackets is obvious when you look at them side by side.

the standard 4" rear track bar bracket is straight and just moves the track bar up in the same orientation as stock

This is RE1603- Standard bracket

This is the RE1602- Angled Rear Bracket

JKS is the only other company I know that makes this angled bracket

The angled bracket allows you to use your stock track bar with the SYE.... the standard bracket will NOT allow you rotate the pinion.

You can you either bracket with an adj track bar with a heim or JJ since it can allow for the misalignment issue.
Currie has a angled bracket too
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Old 06-04-2012, 02:52 PM   #19
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Currie has a angled bracket too
corrected my post... thanks...

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Hella Lighting: Driving, Fogs and H4 E-Codes
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