have a intermittent grinding, noise on 2005 Pontiac Aztek

when turning wheels toward right, either backing or going forward note grinding noise, vibrates. Best described feels like driving over a cattle guard.....mechanics have checked wheel barrings, brakes, rotors and state they can't find anything wrong......any suggestions?

Asked by for the 2005 Pontiac Aztek
Have them check the front CV axles https://www.napaonline.com/Catalog/CatalogItemDetail.aspx?A=NMD959317_0173000780&An=599001+102005+50060+2060043 And you can check that estimate here www.repairpal.com/estimator put in your vehicles info and choose axle half shaft