Death Wobble?

4LWranglerTJ

Member
Joined
Feb 18, 2010
Location
Clemmons/NC State
I Need Help

...with death wobble.
I really need help with this and I have read about death wobble on various forums for the past 3-4 years.

Background story (I'm including everything):
I've had my 2000 jeep wrangler since 08 and put a 4" procomp short arm lift on it that fall. I did install a drop pitman arm. I drove my jeep for 1.5 years and then had gears put in the axles. The gears were not installed right, the front ones broke within ten min offroad and the rear ones have a whine. I drove for 1.5 years on the front axle w/o a carrier/driveshaft/inner axles and on the noisy rear end and the jeep handled the same as before. In fall of 2011, I developed a very bad shake at any speed over 25 mph when I hit a rough bump or pothole in the road (fortunately it has not happened on the highway). In December of 2011, I go ahead and replace the front axle with a HP Dana 30 from ECGS, installed by me and I did not do a proper alignment after installation. I drove on it for 600 miles just fine (mostly highway), come back to school in Raleigh, and it starts shaking again, just as bad as before. About a week ago, I take it to Todd at Affordable Transmission on Capital BLVD in Raleigh thinking it could be a driveline problem like broken teeth in the rear end getting into the gear mesh. He says the teeth are fine, but the bearing is messed up, the transfer case dampener? and chain were messed up, and my 5th gear was messed up, so I said fix it and I am assuming he did all of that (It was expensive). I pick it up from him yesterday, drive it back to my apartment and lo and behold, it still had death wobble. Well I take it to Murray's Tire off of S Saunders st to look at my steering setup. The mechanic drove it with me in the passenger seat to diagnose the problem and he was scared after he experienced the death wobble. He put it on the lift, and I explain to him that I have read possible causes are caster/toe angle, bad TREs, etc. and he thinks I need an adjustable track bar or bracket, new bushings, and a steering stabilizer. I claim that the track bar should be fine (I rode on it for 2.5 years with no problem and then it develops it. I think it could potentially be the upper control arm bushings like he said, but everything I've read in the passed points to bad TREs or improper steering angles. The mechanic still claims that there is no way that shaking is coming from improper caster and toe. So they send me on my way, it didn't cost anything, and gave me the impression to buy new upper control arm bushings.

I am not currently running a steering stabilizer. I bought the OME one, installed it about 2 years ago, took it off when I swapped the ECGS axle over because one of its bushings were destroyed anyways (I think that is due to me over tightening the nut on the bolt and squeezing the rubber bushing), and some people don't run them saying the cover up any issues. I am getting fed up with spending all of this money and not having a drivable vehicle, and am asking for advice. I don't really have the time to fix it myself even if it is an alignment, and I'm willing to go to a shop as long as it gets done correctly. I've done the whole "jack up the front end and move the steering wheel, see what is moving wrong thing" and everything looks good to me.

Are there any good shops in Raleigh that deal with lifted vehicles/ know what death wobble is? Should I replace the upper control arm bushings? Should I get an alignment done and see if that fixes things? As a reminder, the shaking happened before and after I installed the front axle.
 
Death wobble is caused by one or more of the following:
-Severe imbalance of wheel/tire combo
-Worn/failed/loose something that locates the front axle
-Way wrong caster
-Out of round wheel/tire combo
-Really worn steering components
- Too much toe-in or toe-out

Usually, I find a trackbar bushing worn or a TRE on the trackbar worn. MOST of the time this will be enough to multiply other items that are marginal into a full-blown death wobble.
With the engine off, have someone rock the steering wheel back and forth from approx 11-1 o'clock. Climb under the front of the Jeep, look for ANY play in the trackbar. Look for excessive play in the control arm bushings.
Don't sweat loose sway bar items, they don't locate the axle.
Make sure the tires are balanced WELL. Make sure the toe-in is 1/8". Make sure caster is correct, approx 6-7*.
Check all of that and report back.
 
death wobble

I have owned my own shop,in wake forest,and worked at a shop in wake forest doing lifts.I have about 12 years experience with lifts.Every jeep i have ever seen with a lift gets DW.I have found that the best thing to do is get a buddy to turn to wheel back and forth while on the ground and not running.check all your bushins,track bar,control arms,steering joints,ball joints.And alignment,tires out of balance will cause this.It is a pain in the a-- sometime to get rid of.I would put at least a single steering stabilizer on it.
 
Thanks for the help so far. So my plan is to examine the track bar and see if there is any play in either the bushing or TRE and then get it aligned if that checks out. I feel like it has to be something wearing out bc it didn't happen for a long time after I lifted it.

sell the jeep..lol. good luck with it though.

Haha, I was looking at moving on to a 3rd gen 4runner, but after dumping 2k into this drivetrain last week, I think I will be keeping it for a while. Besides, I would feel bad selling a Jeep that's not running correctly. It's small size, noise, rough handling, and cost to fuel it are taking it's toll after 4 years. Plus the GF isn't a real big fan of it. It's fun, but it only sees pavement in it's current state :(
 
When I lifted my 00 TJ to 3.5" with shortarms, I had death wobble. Then I put longarms on and it went away. I did still have the stock steering and stabilizer before and after.
Over the next couple of years, I accumulated 4.5" springs, and all was fine.
Then, I swapped in a D60HP frontend and stock steering box and steering configuration, but NO steering damper. Everything was happy, rode well, steered ok, but was way too weak for the tire size.
To overcome that, I installed hydro assist. Suddenly, I had death wobble again. I thought it was a fluke. Everything was like new and recently built. New TRE's, new trackbar bushings, good condition control arms, balanced tires, etc. The ONLY thing I found that fixed it was a steering stabilizer. Somehow the feedback between the hydro assist and the regular steering was causing the harmonic frequency, and the stabilizer damped the harmonic out and made it well again. I drove the jeep like that for probably 5 years, never had another problem. I guess what I'm saying is don't be afraid to put a stabilizer on there if you've chased out all the other problems.
 
Thanks for all of the help! I especially want to thank Lee for helping me out today and explaining what was going wrong. I drove my Jeep over to his shop once I got out of my classes and he put it on the lift and showed me what was going on. What he found was that the TRE on the drag link that connects to the pitman arm had some play in it, and the castle nut was loose somehow so he was able to tighten that. He also explained that the steering box was also going, but he was able to temporarily fix the problem by just tightening the castle nut. I asked him to give me a quote to permanently fix everything and I know I will be doing business with him in the future once I am able to earn some more money. I also plan to put the stabilizer back on because it will probably prevent all of the vibrations from doing more damage to the steering box/linkages.
 
come by my shop, i will check it for free and let you see what's being done at the same time.

Hey I had a few cases of Death Wobble on my way out to Uwharrie his weekend. Sounds like I need to find this Lee fella and get him to give me a hand tracking it down.

Glad you seem to be getting somewhere now.
 
death wobble

I have owned my own shop,in wake forest,and worked at a shop in wake forest doing lifts.I have about 12 years experience with lifts.Every jeep i have ever seen with a lift gets DW.I have found that the best thing to do is get a buddy to turn to wheel back and forth while on the ground and not running.check all your bushins,track bar,control arms,steering joints,ball joints.And alignment,tires out of balance will cause this.It is a pain in the a-- sometime to get rid of.I would put at least a single steering stabilizer on it.

I have never had it in any jeep ive owned, leaf springs are boss.
 
Torques are for dorks. Impact it till it rounds off, duh!
 
Back
Top