Coated for corrosion resistance Excellent greaseable, the nibs fit just fine after assembly lots of clearance. Install them and grease up on a regular basis. Report this review These ball joints connect your vehicle’s control arm to its steering knuckle, and feature a polyurethane dust boot and one-piece housing. 46D0048A AC Delco Ball Joint Front Driver or Passenger Side Upper for F450 Truck ACDelco Advantage ACDelco Control Arms, Ball Joints & Assemblies For Ford F-250 Super Duty For Sale Front Upper Ball Joint Undergo extreme impact, wear, and fatigue testing to ensure quality and durability ACDelco 46D0088A - Front Upper Suspension Ball Joint Assembly Forged housing for durability These dependable aftermarket suspension ball joints offer quality and performance, all at an economical price.