caldwell_sean

Ok so i need y'all's help i just last weekend put new bilstein 5100 shocks on my 94 jeep XJ with a 4.5 lift and ever since then if i hit a bimp or what not at 65+mph it shakes like a **** i have all new steering and steering damper, and i just dont know what it could b so plz help if u have had this problem?

Condonsation

Try replacing the ball joints

SeriousOffroad

It's called Death Wobble, been covered many times.

Use the search button above and you'll find ton's of info on the subject.

Condonsation,
There's simply no way to diagnose the OP's problem with limited info he posted. Posts like this cause people to throw money at parts they may not need.

Please think about what you're posting before hitting the enter key.

Condonsation

Ya i know death wobble. This is true but I mean it dont hurt to replace ball joints that if havent been changed are prob shot anyway. And a steering stabilizer is only masking the real problem

tjwalker

My understanding of “death wobble” is this. Somewhere in the vehicle, one or more components is worn beyond tolerances, and when oscillation initiates from a suspension “traumatic” event (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. It 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…..

Check out the below link if you would like some extensive reading on “death wobble” causes and cures. From my research, Kevin (the author of this tutorial) is possibly the best in the business with tracking down root cause of death wobble. He does offer hardware for sale that can help resolve death wobble, but even if you don’t buy any parts from him, you can still get some excellent ideas on what to look at in resolving your death wobble.

http://www.kevinsoffroad.com/how-to-...-death-wobble/

Possible causes of death wobble are listed below. Isolating death wobble is a process of elimination and the root cause is not always obvious and it can often be caused by a combination of things! 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. Don’t laugh. It’s 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)
-Worn/damaged shocks
-Worn/damaged tie rod end
-Bad U Joint
-Bad ball joint
-Loose frame mount
-Steering box loose
-Bad front hub assembly

caldwell_sean

Ok uall want more info this is what i have done prier to changing the shocks( witch i did not have dath wabble before then). All my steering links have been changed out with new ones, new track bar new lcas, new upc bushings, new upper and lower ball joints, new steering stableizer, new axle shaft ujoints, new front drive shaft ujoints, and an alinement 1month ago. all this was replaced becouse they were bad and all of it was done before i changed the shocks and i did not have any wabble.

SeriousOffroad

Something other than shocks is the root of your problem.
I'd take a long hard look at the trackbar mount on the axle. Pull the TB and see if the hole is wallowed-out.

Triple check the frameside trackbar mounting bolts.

Check the toe-in, safe bet that it may be out.

caldwell_sean

Ok i well check the toe in the morning i already checked the trackbar and everything is good on it.