This is built into the car and is a nation wide complaint on all Jeeps. Contact the dealer for help or the factory assistance line. You could try adding more negative Castor adjustment to the front end , that may help.
SOURCE: 97 jeep grand cherokee, strange pop\clunk sound
Check the front stabilizer bar and the bushings on it. It is located under the radiator with arms that bend back to each front tire.
SOURCE: My grand limited jeep cherokee shakes when I am
Hitting a bump and then having oscillations of the steering whell is a sure sign of worn bushings, tie rod ends or an internally worn power steering box. The only way to find out is to jak the front of the car up and then rest the car on jack stands from the FRAME of the far. Then grasp each tire / wheel at 3 and 9 o'clock pushing and pulling while checking for any signs of movement or looseness. Your checking the ball joints, control arms, wheel or spindle bearings and tie rods for wear. Also grasp the tire at 6 and 12 o'clock positions and check for movement in sterring components. The people that did the alignment should have mentioned that you had steering or suspension component wear. They also should have stated that they can not do an alignment without repairing / replacing the worn components. Any wear in steering or suspension parts will cause the symptom that you described. If you just had the alignment.... take the car back to the shop and have them re-check the suspension parts for wear. Most alignments come with a 30 day warranty.
Thanks for using FixYa.
Kelly
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