System: suspension; front control arm; upper; ball joint.vehicle description: multipurpose vehicles equipped with 4-wheel drive. Note: if your vehicle IS presented to an authorized dealer on an agreed upon service date and the remedy IS not provided free of charge within a reasonable time, please contact chevrolet at 1-800-222-1020 or GMC at 1-800-462-8782.also contact the national highway traffic safety administration's auto safety hotline at 1-800-424-9393.