Dorman 539-855 Suspension Ball Joint - Front Upper

Dorman 539-855 Front Upper Ball Joint

Dorman 539-855 is a threaded suspension ball joint engineered as a direct replacement for specific front upper applications. It is built from steel with a protective dust boot and mounting hardware included, making it a practical service part for Mazda 6, Ford Fusion, Lincoln MKZ, Mercury Milan, and Lincoln Zephyr front suspension repairs.

Key Features

• Steel construction with a grey finish
• Threaded design with tapered stud
• Dust boot included; polychloroprene boot material
• Mounting hardware included
• Premium suspension grade type
• Non-greaseable, non-adjustable design
• 12 mm wrench size
• Part number 539-855

Detailed Description

This Dorman suspension ball joint is precision-engineered and tested for reliable OE-style replacement on specific vehicles. It is a front upper ball joint for 2003-2007 Mazda 6, 2008-2013 Mazda 6, 2006-2012 Ford Fusion, 2007-2012 Lincoln MKZ, 2006-2011 Mercury Milan, and 2006 Lincoln Zephyr. The threaded, press-in style construction and tapered stud are suited to front suspension service where a worn joint can affect steering response and alignment stability. This part cross-references MOOG Chassis Products (e.g., K500041, K500381) for the same application.

What It Helps Fix

• Front-end clunking or popping from a worn upper ball joint
• Excessive play in the front suspension
• Uneven tire wear related to suspension looseness
• Loose or imprecise steering feel
• Inspection failure caused by ball joint wear

Installation Notes and Tips

Fits 2003-2007 Mazda 6, front upper; 2008-2013 Mazda 6, front upper; 2006-2012 Ford Fusion, front upper; 2007-2012 Lincoln MKZ, front upper; 2006-2011 Mercury Milan, front upper; and 2006 Lincoln Zephyr, front upper. Confirm the vehicle’s front upper suspension configuration before installation. Because this is a press-in style ball joint, proper removal and installation tools are recommended to avoid damage to the control arm or surrounding components. Verify stud taper and hardware fitment during assembly, and complete a front-end alignment after service.

Quality Assurance

Dorman positions this part as a precision-engineered replacement that is rigorously tested for dependable service on the listed applications. Part number 539-855 is built to meet the demands of front suspension repair on Mazda 6, Ford Fusion, Lincoln MKZ, Mercury Milan, and Lincoln Zephyr models.