Dorman 540-007 Suspension Ball Joint - Rear Upper

Dorman 540-007 Rear Upper Ball Joint

Dorman 540-007 is a threaded, press-in suspension ball joint built for rear upper applications on select Ford, Lincoln, and Mercury SUVs. It is precision-engineered and tested as a direct replacement for the original equipment part on the listed vehicles.

Key Features

• Threaded suspension ball joint for rear upper placement
• Steel construction with a grey finish
• Dust boot included to help protect the joint
• Premium suspension grade type
• Press-in mounting style with pinch-style stud
• Mounting hardware included
• 12 mm wrench size
• Part number 540-007

Detailed Description

This Dorman suspension ball joint is designed for 2002-2005 Ford Explorer rear upper, 2003-2005 Lincoln Aviator rear upper, and 2002-2005 Mercury Mountaineer rear upper applications. The steel body, threaded design, and press-in mounting style support a precise OE-style replacement where the original rear upper ball joint has worn or loosened. The dust boot helps shield the joint from road contamination, while the premium suspension grade construction is intended for dependable service in the suspension system. If you are replacing a worn rear upper ball joint on a Ford Explorer, Lincoln Aviator, or Mercury Mountaineer, Dorman 540-007 provides a direct-fit service part for the listed vehicles.

This part cross-references MOOG Chassis Products (e.g., K500109, K500169) for the same application.

Common Problems This Part Can Address

• Clunking or popping noises from the rear suspension
• Excessive play in the rear upper suspension joint
• Uneven tire wear related to suspension looseness
• Loose or unstable rear suspension feel over bumps
• Failed original ball joint boot or contaminated joint surfaces

Installation Notes and Tips

Verify rear upper fitment before installation on the specific year and model. Because this is a press-in style ball joint, proper suspension service tools are typically required for removal and installation. Inspect the surrounding control arm and related suspension components for wear before completing the repair. Confirm the 12 mm wrench size and pinch-style stud interface during assembly.

Quality Assurance

Dorman manufactures this replacement ball joint as a precision-engineered part that is rigorously tested for reliable service on the listed applications. Part number 540-007 is built to replace the original equipment design on compatible Ford, Lincoln, and Mercury rear upper suspension setups.