RepairPal Certified shops can diagnose and repair your 2006 Ford Expedition. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Ford & other manufactures, stopped using greasable ball joints some time ago. Unfortunatly, now they only last about 60,000 miles. 1/8 inch play is still acceptable, 3/16 you should look to replace.