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We went to 4Wheel Parts Performance Center in Escondido, California, where Jay Miller helped us install our TeraFlex 4-inch WJ Suspension System. According to TeraFlex, about 5 percent of Grands may develop some serious vibrations in the frontend as a result of the lift. To prevent this, TeraFlex offers some different arms and weld-on brackets to help better triangulate the front suspension geometry once it is lifted, and thus get rid of the vibration.