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  #1  
Old November 13th, 2017, 15:36
blakews2217 blakews2217 is offline
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Yet another death wobble help request

So Iíve been in and out of the front end of this thing for months. Itís a 2000 xj classic aw4 with a 241 I believe also with a 2 inch lift and shocks.
Shortly after the lift was done I was developing death wobble slowly. I ordered and installed a track bar first. No difference. Next I ordered LCA and UCA bushings. Couldnít do the top ones due to lack of time but the lowers made a world of difference. I went from being banished to under 40 to being able to chance runs to 50 or 60. Still not right though. I was due for tires so I put on some 265/75/r16 handcook dynapro ATMs. I also did the UCA bushings and all the TREs today. Eyeball and tape measure aligned it. Still a violent wobble. Bad enough to almost make me lose control. The track bar and drag link are parallel atleast to what I can see. Now I sit in my house frustrated Iíve dumped so much money into the front end. Iím reaching the end of my patience quickly and have run out of ideas. Any help would be appreciated.


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  #2  
Old November 13th, 2017, 16:09
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smokeyyank smokeyyank is offline
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Re: Yet another death wobble help request

Just a thought, I cracked my unibody at the steering box and it's what caused my issues. Also suggest going back through every bolt and making sure it's tight. Out of curiosity what track bar did you put in?
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  #3  
Old November 13th, 2017, 16:16
lawagoneer lawagoneer is offline
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Re: Yet another death wobble help request

Another common place to loom is the axle end track bar mount. The bolt hole will enlarge and can cause hard to diagnose death wobble
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  #4  
Old November 13th, 2017, 16:21
RCP Phx RCP Phx is offline
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Re: Yet another death wobble help request

Yes a couple notes here. What trackbar did you buy? And get real alignment numbers first! The angles only effect the bumpsteer.
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  #5  
Old November 13th, 2017, 16:54
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techno1154 techno1154 is offline
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Re: Yet another death wobble help request

And ball joints???

I had the same problem as you do. I replaced, tightened, checked and re-checked everything on the front end and nothing helped. The I removed the steering knuckle and found the ball joints were bad,....especially the lowers. They showed no up and down movement when everything is installed. Dismantled, they had plenty of side to side movement. My highway speed have moved from 40 MPH to upward of 80 MPH after they were replaced.

Proper balancing of the tires and alignment are crucial.
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1996 XJ; 4.0L; AW4; NP231; SYE; D30 and D44; ECTED; 4.10 gears; 30X9.5 -15 BFG/AT/KO; 3" lift; Rusty's LCA; JKS ADJ UCA; Kevins ADJ Track bar; Drawtite Front Receiver; Dual Electric Fans; Dual Battaries.
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  #6  
Old November 13th, 2017, 19:26
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themauler themauler is offline
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Re: Yet another death wobble help request

Before you buy any more parts get the castor right and the front axle toe in correct. I have been there clueless holding out to get an alignment. Decided to take it to the shop, got it back a whole new animal.

How many miles are on the front axle components?
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Old November 13th, 2017, 19:45
blakews2217 blakews2217 is offline
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Yet another death wobble help request

Quote:
Originally Posted by smokeyyank View Post
Just a thought, I cracked my unibody at the steering box and it's what caused my issues. Also suggest going back through every bolt and making sure it's tight. Out of curiosity what track bar did you put in?

When I swapped my steering box ( that was a whole other issue) I looked around and didnít see anything but that was about 9 months ago. The track bar I got was the OE type from rock auto. Iíll go get it aligned after payday. Should I put the ball joints in before that? Is there a castor adjustment? I only saw the toe adjustment. Also, the tire shop I had mount and balance my tires said that the tires didnít balance too well. I just wanna say thanks to everyone who responded.


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  #8  
Old November 13th, 2017, 19:49
blakews2217 blakews2217 is offline
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Yet another death wobble help request

Quote:
Originally Posted by themauler View Post
Before you buy any more parts get the castor right and the front axle toe in correct. I have been there clueless holding out to get an alignment. Decided to take it to the shop, got it back a whole new animal.

How many miles are on the front axle components?


Depends on what parts? I replaced every suspension part between the axle and the body except the springs and all the steering linkage as well. I did notice some play on the input side of the steering box but I find it hard to believe that would do it. The oldest part that is routinely changed is the driver side u joint and both wheel bearings.


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  #9  
Old November 14th, 2017, 08:41
RCP Phx RCP Phx is offline
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Re: Yet another death wobble help request

Well stock trackbars are junk! That also means your axle is not centered unless something been done you haven't told us about Again, check the mounts on both ends for "wallowed" out holes and loose bolts. Check all the tre's and check the ball joints. The list goes on and on for DW!
Caster can only be changed by adj arms or adj/offset ball joints but not likely your problem since you increased the caster vs running to little.
Camber can only be changed with adj/offset ball joints but again not a likely cause.

Last edited by RCP Phx; November 14th, 2017 at 08:57.
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  #10  
Old November 14th, 2017, 09:26
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ehall ehall is offline
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Re: Yet another death wobble help request

anything on the front end is suspect. Broken steering brace, ball joints, two things you haven't replaced that are probable.

Its not wasted money, you're resetting the maintenance clock on all this stuff, probably needed doing anyway
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  #11  
Old November 14th, 2017, 13:21
Green XJ Jeep Green XJ Jeep is offline
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Re: Yet another death wobble help request

I have had worn brake pad sliders on the knuckle causing the pads to hang up causing death wobble.
A sticky caliper will as well.
Lots of potential causes you just need to keep picking away at it
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  #12  
Old November 14th, 2017, 17:31
RCP Phx RCP Phx is offline
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Re: Yet another death wobble help request

Quote:
Originally Posted by ehall View Post
anything on the front end is suspect.
Well said! I also didn't see any mention of the "drag-link"?
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  #13  
Old November 14th, 2017, 18:13
blakews2217 blakews2217 is offline
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Yet another death wobble help request

The drag link is parallel to the track bar. As for the cause I believe Iíve found it. First of all donít trust your previous work. I found the frame side of the track bar was 1/3 turn loose. Got it tightened and kept lookin. I found the frame is cracked right under the steering box and up the side. This is a perfect excuse for a winch bumper. Thanks everyone. I tack welded the bit I could reach with a fuzz box but still needs supported. I found this with a buddy cranking on the wheel while I was looking. I saw what looked like the steering box and the frame separated only while cranked to the passenger side.


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  #14  
Old November 14th, 2017, 19:28
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ehall ehall is offline
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Re: Yet another death wobble help request

There ya go, that crack will make a ton of vibration at the magic frequency
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Old November 14th, 2017, 21:17
blakews2217 blakews2217 is offline
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Yet another death wobble help request

Quote:
Originally Posted by ehall View Post
There ya go, that crack will make a ton of vibration at the magic frequency


Itís not big but with it being unibody I can see that doing all set up work for dw to go to town. I girl Iíll swap my exauest headset at the same time I weld that up. Ontop if the weld Iím going to build a better brace and a backing plate on the other side of the frame. Basically making a frame sandwich. Iíll post pics as it comes along. Itís easy when you have access to a full machine shop with cutting torch and welder along with mills and lathes and plenty of hand tools. Also, no sway bar so I can incorporate that and build a bolt on brace. Maybe make a basic stiffener that runs both sides?


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