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Hello and thank you for your question,One common cause for the type of problem you are having can be caused by the replacement ball joints being over tightened when they where replace and when this happens it will give you pointy steering or what they are calling memory steering. If greasing the ball joint seam to help then that is very likely what you have going on here. The upper ball joint calls for 76 ft LBS of torque and the lower joint calls for 111 ft LBS . of torque. If there over tight they will cause the type of steering your getting. Have your front end shop check the torque on them as well as the tie rods , the tie rods call for 76 ft LBS as well.