Anyone have experience with the "Death Wobble" in a 1999 Cherokee?

 

2 people. 1 turns steering, engine off. 1 is watching to see what moves while wheel is turned back & forth 🤔. Replace the sloppy parts. Repeat. Track bar bushing is common flaw

 

^^^ this is a good start ^^^

Inspect track bar mounts and hardware, remove track bar bolt from axle and inspect mounting hole for sloppy fit (egged out or an oval hole instead of round hole) if you find this then you have a problem on your hands.

Steering stabilizers and sway bar links aren't going to fix death wobble btw

 

Unless the trackbar bush and/or tie rod end have been replaced within a known time frame, I would start my testing there

If in any doubt whatosever, these items should be replaced. They are wear items, and nothing has as much influence on death wobble than these.

Check the trackbar bush bolt has not wallowed out the front mounting hole, it should be 10mm

You do not say if the vehicle has lifted, that makes a big difference

As well as the steering wheel procedure, if you raise the front of the vehicle slightly, use a pry bar and block of wood under each joint

 

My understanding of “death wobble” is this. Somewhere on the vehicle, one or more components is worn beyond tolerances, and when oscillation initiates from a suspension “traumatic” event (like hitting a bump or a pothole) or also when a vibration reaches a certain point and harmonic at a certain speed, it causes the other components to react. This is called the “multiplier effect”, where one component affects one or more other components as the event travels through the front end of the vehicle.

Death wobble is not uncommon with the XJ! It is even more common with a lifted XJ. Finding the worn component or components is not always easy and can sometimes be downright difficult. Sometimes it’s obvious, other times everything appears to be okay when you perform an inspection on a hoist, but getting the vehicle up in the air and going over everything with a fine tough comb is always a good first step. Have a friend turn the steering wheel back and forth full travel as you perform the inspection. It is very helpful if you know exactly how to perform a comprehensive inspection of every single front end part, looking for abnormal wear and or play in that hardware. If you do not know how to do this type of inspection, pay an experienced professional to do it. Be sure to ask them if they are familiar with “death wobble”, as not all technicians are versed in this…..

Possible causes of death wobble are listed below. Isolating death wobble is a process of elimination; the root cause is not always obvious and it can often be caused by a combination of things! Always chase and resolve death wobble because if it is not resolved, it is such a violent event that it has the potential to seriously damage front end parts. From my personal experience, I would first concentrate on the track bar and the control arms and associated bushings.

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-Front tires out of balance (try swapping fronts to rear; see if symptoms change)
-Tire pressure. It’s definitely not a root cause but can exaggerate the problem. Experiment with lower tire pressure to see if it helps
-Improper lug nut torque on wheels
-Front alignment out of spec
-Loose track bar
-Worn track bar bushings
-Worn track bar (check for play!!)
-Bad control arms and associated bushings
-Worn/damaged steering stabilizer (not generally a cause in and by itself but can help in control of DW)
-Worn/damaged shocks
-Worn/damaged tie rod end
-Bad U Joint
-Bad ball joint
-Loose frame mount
-Steering box loose
-Bad front hub assembly

 

Track bar and drag link must be parrallel. On modified jeeps this may have been altered.