Question about Jeep Cherokee

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I have a 1996 Jeep Grand Cherokee and every time i go over a bump at 40mph it shakes really bad in the front end and i had a allighment done.

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The symptom you have posted is generally termed "death wobble".
It's scary when it happens and unless you are a very good driver, (and lucky) it's dangerous.
The cause is sometimes difficult to pinpoint usually because it can come from a variety of conditions.
First, you need to have every pivot in the front suspension carefully checked for play. Most often the condition is caused by bad ball joints. BUT, it can also be caused by play in any other suspension joint or even a combination of various parts that have wear that individually would be considered not dangerous but combined the total is enough to cause the front end to move excessively.. Two places to check very carefully are the track bar where it mounts to the chassis as the bolt hole can become oblong and the steering box mount bolts which sometimes can loosen or the chassis itself can tear around the bolts.
One other cause is improperly torqued wheel lugs. Easy to check... just loosen them and re-tighten to about 70 foot pounds in a star, not circle pattern. Wheels must be straight and tires should be properly balanced and have no broken belts etc.or anything else you check may not help.
Often the steering stabilizer (sideways shock connected to the suspension linkage) is blamed.
That component can be damaged by excessive wobble but should never be considered as a cause.
An alignment may be helpful but is more helpful as a last resort, actually putting the caster setting more positive by at least a degree more than factory setting. That forces the front wheels to want to track straight ahead and resist wobble.
If I were asked to bet on the cause without actually seeing and examining your vehicle, I'd bet on the ball joints though. Over 90% of the ones I've dealt with have had bad bj's. When replaced, the condition disappears.

Posted on Oct 02, 2010

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I had the same problem.(felt like the tire was about to rip off the jeep until I slowed down) Changed the steering stabilizing shock and the problem was solved. (please rate if this helps Thank you)

Posted on Dec 22, 2010

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