Dorman 539-980 Suspension Cross Axis Ball Joint - Rear Lower At Knuckle

OE-Style Suspension Cross Axis Ball Joint

Dorman 539-980 is a replacement cross axis ball joint built to match the fit and function of the original equipment part. It helps securely locate the suspension knuckle on select Ford, Lincoln, and Mercury rear lower knuckle applications.

Compatible with 2002-2005 Ford Explorer, rear lower at knuckle; 2003-2005 Lincoln Aviator, rear lower at knuckle; and 2002-2005 Mercury Mountaineer, rear lower at knuckle. This Dorman 539-980 part number is a direct-fit suspension service component for vehicles that need OE-style geometry and mounting.

Key Features

• Replacement cross axis ball joint for suspension service
• Matches original equipment fit and function
• Steel construction for durable suspension support
• Premium grade type
• Bolts/studs included
• No grease fitting and non-greaseable design
• Not adjustable

Detailed Description

Dorman 539-980 is engineered as a suspension cross axis ball joint bushing replacement for rear lower at knuckle locations. It is designed to restore the connection point that helps position the suspension knuckle accurately, which is important for maintaining proper rear suspension alignment and stable handling. The steel construction and OE-style fit make it a practical service part for Explorer, Aviator, and Mountaineer rear suspension repairs. If you are replacing worn suspension hardware on a 2002-2005 Ford Explorer, 2003-2005 Lincoln Aviator, or 2002-2005 Mercury Mountaineer, this part number 539-980 is built for that application.

This part cross-references Mevotech Supreme MK80010 for the same application.

What It Is Used For

• Replacing a worn or damaged rear lower knuckle ball joint bushing
• Restoring secure suspension knuckle location
• Addressing looseness or play in the rear suspension connection
• Correcting noise from a deteriorated suspension joint area
• Supporting proper rear suspension geometry on Explorer, Aviator, and Mountaineer models

Installation Notes and Tips

Install at the rear lower at knuckle position only on the listed vehicles. Verify suspension condition before installation and inspect related bushings, knuckle hardware, and mounting points for wear. Because this component is non-greaseable and does not use a grease fitting, service access after installation is limited, so confirm the part number and application before beginning the repair.

Quality Assurance

Dorman supplies this replacement part as an OE-style service component intended to match original fit and function for the listed applications. The premium grade construction and steel material support consistent replacement quality for suspension repair work.