Dorman 540-039 Suspension Ball Joint - Front Lower

Dorman 540-039 Front Lower Ball Joint

Dorman 540-039 is a threaded, press-in suspension ball joint built for front lower service on select Ford and Lincoln applications. It is precision-engineered and tested for reliable OE-style replacement on the vehicles listed below, including the Ford F-150, Ford Expedition, Lincoln Navigator, and Ford GT.

Key Features

• Threaded suspension ball joint for front lower installation
• Steel construction with a gray finish
• Dust boot included for joint protection
• Ball joint assembly included
• Mounting hardware included
• Premium suspension grade type
• 12 mm wrench size
• Tapered stud design with 35.5 mm stud thread length
• Press-in mounting type

Detailed Description

This Dorman suspension ball joint, part number 540-039, is designed for front lower suspension service where a worn joint can affect steering feel, tire wear, and front-end stability. The steel body, threaded design, and included dust boot support dependable replacement performance in demanding suspension applications. It cross-references MOOG Chassis Products K500318 for the same application.

Compatible With 2015-2020 Ford F-150, front lower; 2018-2024 Ford Expedition, front lower; 2018-2024 Lincoln Navigator, front lower; and 2017-2022 Ford GT, front lower. The Dorman 540-039 is a direct-fit service part for these front lower positions and is built to match the original equipment layout on the listed vehicles.

What This Part Helps Address

• Front-end looseness or play from a worn lower ball joint
• Clunking or popping noises from the suspension
• Uneven tire wear related to suspension joint wear
• Steering instability or wandering at the front axle
• Inspection failure caused by excessive ball joint movement

Installation Notes and Tips

Verify vehicle fitment by year, make, model, and front lower position before installation. This part uses a press-in mounting type and a tapered stud, so proper suspension service tools and alignment procedures are recommended after replacement. Confirm the existing suspension configuration and compare the original joint dimensions, including overall length, width, and outside diameter, before installation.

Quality Assurance

Dorman states this ball joint is precision-engineered and rigorously tested to provide a reliable replacement for the original equipment on specific vehicles. The part number is 540-039.