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Unread 01-21-2005, 05:46 PM   #1
Acidus
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Wobble with New Lift "Done Right" (kind of long)

I just had a RE SuperFlex 3.5" put on my '04 Rubicon automatic, with 33"x12.5"x15 BFG Muds on Mickey Thompson Classics.

I read and re-read everything I could find about lifts before having it done by a local, popular, very reputable shop. They told me having a vibe was hit or miss with an automatic, and hard to get rid of. Based on what you guys have said, I suggested a CV driveshaft installed if they thought that would fix any vibe and they agreed it was a good idea (a Rubi doesn't need an SYE).

Things installed:
RE 3.5" SuperFlex
JKS disconnects
OME shocks
RE Rear Adjustable Control Arms
RE Track bar
Pitman Arm
Rubicon Fixed Yoke Kit (I thought the Rubi already had this??)
CV Driveshaft (rear)
1310 crossover u-joint
Teraflex shock relocators (rear)
MT 15" Classics
BFG 33x12.5x15's

Tires balanced, and alignment done.

No TC drop
No steering stablizer

I picked it up Wednessday and they want it back in 500 to 1,500 miles to re-tighten everything up. I expected it to drive a little different and it did, but not bad I thought.

Today I had to take a trip down the interstate. When the speedo hit 55 mph I got this really bad wobble. It seemed like it was coming from the front end. Looking at the pavement, you could see the hood shaking, the steering wheel was also wobbling. It went away for a while as I sped up, but came back when I slowed to 55 mph. My mind's eye pictured loose bolts on the front wheels, wobbling away ready to come off. I took the next exit to check and the wheels were fine.

On the drive back, same thing. 55 mph is the worse, and the wobble returns around 65 mph but not as bad. Under 55 you don't notice anything wrong, at 70 its ok.

I'm wondering if this is the "Wobble of Death" or just a "Wobble of Annoyance".

Also, as I was backing in to my parking spot at work I heard this really bad noise just for a split second. It sounded like a piece of 1/4" steel plate being dragged accross pavement. Only for a split second. Haven't heard that noise again and don't know if it means anything.

Any suggestions on what would be causing this, and suggestions on fixing it, or if I should just live with it, would be appreciated.

Thanks

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Unread 01-21-2005, 05:51 PM   #2
MR.CLIFFORD
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what RE track bar did you use and what drop pitman arm??
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Unread 01-21-2005, 05:52 PM   #3
Zim97tj
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It could be the pitman arm, you shouldn't need it for that amount of lift.
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Unread 01-21-2005, 05:53 PM   #4
MR.CLIFFORD
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also wondering what you did about the short arms up front
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Unread 01-21-2005, 05:54 PM   #5
Acidus
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I didn't order the parts, the shop did. They are listed as:
RE1600 Rubicon Track bar for XJ/MJ/ZJ/TJ
YJ4Arm Pitman Arm for CJ/YJ/TJ/XJ
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Unread 01-21-2005, 06:02 PM   #6
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its just cause you have no tc-drop..
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Unread 01-21-2005, 06:28 PM   #7
Acidus
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I'm not a mechanic, but why would I need a tc drop with a CV driveshaft?
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Unread 01-21-2005, 06:34 PM   #8
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May not be you, but alot of folks have cured wobble with a steering stab.
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Unread 01-21-2005, 06:42 PM   #9
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I asked them about a steering stabilizer before they did the job. They said the stock one is fine if the lift is "done right". They said I didn't need it.

My thoughts were maybe the wobble could be from the front drive shaft (even if its disengaged), or tires not being balanced good enough? But like I said.... I'm not a mechanic.

I'm also wondering how serious this is... just live with it?
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Unread 01-21-2005, 06:44 PM   #10
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Don't know how serious it is, but I wouldn't want to live with it. IMHO
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Unread 01-21-2005, 06:47 PM   #11
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i have have death wobble for over a year now i am currently installing an axle with tbt crossover steering and this is said to be a cureall for dw....so we'll see how that goes...i would make sure your track bar is on good and tight and make sure your sway bars are hooked up if i unhook the sway bars look out! itsdw all the time
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Unread 01-21-2005, 06:49 PM   #12
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Quote:
Originally Posted by jeeptj97
its just cause you have no tc-drop..

Death Wobble has nothing to do with a tc drop. Drivetrain vibration and death wobble are two COMPLETELY different things. I have suffered through both, and have resolved both.

Death wobble is the result of problems with the front suspension, and can be caused by one or many factors. Things that have caused mine at one time or another are toe, caster, steering stabilizer mount rounded out, and out-of-balance front tires.

Out of balance tires will cause DW on any surface as soon as you hit 45-50 mph, it will start happening, where as suspension-related wobble is usually triggered by hitting a small bump in the road that sets the wobble into action.

To the poster- do some searches on death wobble and you'll find some info on what it is and how to cure it. For a cool video of a Bronco experiencing DW, check this out:

http://www.emotoman.com/videos/dw.mpg

-Chris
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Unread 01-21-2005, 06:51 PM   #13
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Go back and look at your drive shaft angles. Even if your in 2 hi the front shaft is still engaged on the tj and so is the diff. The only thing that is not engaged is the transfer case. I will bet you are going to need to change the front diff angle and lower your crossmember to achieve the correct angles on both shafts. Mike
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Unread 01-21-2005, 06:53 PM   #14
wherndon
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How many miles are on your Rubi? I wouldn't want to to just start throwing money at it to solve the problem, but a steering stab is not very expensive.
Otherwise, you might see if you could borrow a set of tires from someone just as a test. Maybe just borrow two tire to try on the front.

Also, some of what I have read suggests you don't need a t case drop with the Rubi at that small a lift. But, something else that wouldn't cost anything would be to add some spacers to the t case just as a test.

Good luck, and make sure to post your resolution when you find it.
Bil
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Unread 01-21-2005, 06:53 PM   #15
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Quote:
Originally Posted by Mike Blondin
Go back and look at your drive shaft angles. Even if your in 2 hi the front shaft is still engaged on the tj and so is the diff. The only thing that is not engaged is the transfer case. I will bet you are going to need to change the front diff angle and lower your crossmember to achieve the correct angles on both shafts. Mike
I agree, but this is not what is causing his death wobble, if he indeed has it. Drivetrain vibrations and death wobble are completely independent of eachother.

-Chris
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