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AnswerIt sounds more like you are a victim of what is known in the Jeep community as "death wobble". Here is an article from a jeep guru http:/www.kevinsoffroad.com/techarticles/deathwobble.html

I was also a victim of death wobble and am still replacing parts worn out by the wobble. I started out replacing the stabilizer shock but the problem was still there, just not as bad. Then I replaced all of the bushing on the entire jeep with polyurethane bushings and the death wobble dissappeared immediately. Last problem with the jeep now is it feels loose and the steering wheel vibrates around 70 so I'm trying to figure out if its either the hub assembly or the ball joints. Good luck with yours.

Death Wobble Solution!

Sure replacing the bushings, steering stabilizer and improving the suspension will help. . .but that is not where the problem lies. Take a look at the Power Steering motor itself, you'll notice that the BEARING in the steering shaft that connects to the pitman arm wobbles due to the constant force from turning left and right left and right all the time...this is due to the wear and tear of the steering motor. Jack up the cart get underneath and as someone turns the wheels left and right watch the shaft wobble. THIS IS YOUR PROBLEM! You must replace the steering motor!

Death Wobble Is no fun and not easy to diagnose or fix.

Unfortunately, there are thousands of questions and discussions surrounding death wobble and every one person thinks they have the solution. Even bigger problem: They Do! Death wobble is not caused by one single component in your front end. If you want to sum up the one cause of death wobble it is excessive play. I experienced death wobble for the first time at about 22,000 miles. In the above solution a reference was made to the steering "motor" and I am assuming what is meant by this is the steering gearbox. This is one of the things that can lead to death wobble but it is not the sole answer, nor is it always the root cause. My steering gearbox was, and is, fine. Death wobble doesn't happen as the result of one failing component if your jeep is stock, but one failing component leads to excessive play and the wearing out of others that will allow death wobble to occur. You must take into account how you use your jeep. If you are an off-roader or just a daily driver makes a difference. If your jeep is lifted i cannot offer you any solution because my jeep is not lifted and the lift makes a huge difference. Check all of your bushings, visually inspect your track bar, check your ball joints, check your wheel bearings, check your tie rod ends, make sure your drag link is not bent, even if you have found a solution you should still check everything because chances are other things are worn out as a result of death wobble and if you leave excessive play in any of these front end components death wobble will come back. Also check to make sure every bolt and nut in your suspension and steering components are torqued to specs.

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Q: Why would a jeep's front end shake after hitting a bump?
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