Dorman 538-770 Suspension Ball Joint - Front Upper

Dorman 538-770 Front Upper Ball Joint

Dorman 538-770 is a front upper suspension ball joint for select Mercedes-Benz models, including E-Class, CLS-Class, and SL-Class applications. It is precision-engineered and tested as a direct replacement for the original equipment part, with a bolt-in, threaded design for the specified vehicles.

Key Features

• Front upper suspension ball joint for select Mercedes-Benz applications
• Direct replacement for OE-style fit and function
• Threaded, bolt-in mounting type with 3 mounting holes
• Aluminum construction with grey finish
• Dust boot included; grease fitting, castle nut, cotter pin, and bushings not included
• Premium suspension grade type
• Tapered stud design with 12 mm wrench size
• Cross-references Beck/Arnley 101-6897 and MOOG K500222 for the same application

Detailed Description

This Dorman suspension ball joint, part number 538-770, is built for front upper suspension service on Mercedes-Benz SL500, SL550, SL600, SL63 AMG, SL65 AMG, SL55 AMG, CLS350, CLS500, CLS550, CLS63 AMG, CLS55 AMG, E280, E320, E350, E500, E550, E63 AMG, and E55 AMG applications. It uses an aluminum body, a threaded bolt-in mounting style, and a tapered stud to match the specified OE configuration. The included dust boot helps protect the joint from road contamination, while the premium suspension grade construction supports consistent steering and suspension operation.

For buyers searching for a Mercedes-Benz front upper ball joint replacement, Dorman 538-770 is a fitment-specific option for the listed E-Class, CLS-Class, and SL-Class vehicles. It is also referenced by other aftermarket part numbers, including Beck/Arnley 101-6897 and MOOG K500222, for the same application.

What It Helps Address

• Front-end looseness or play from a worn upper ball joint
• Clunking or knocking noises from the front suspension
• Uneven steering response caused by joint wear
• Suspension movement issues at the upper control arm connection
• Inspection failures related to ball joint condition

Installation Notes and Tips

Verify vehicle year, model, and front upper position before installation. This part uses a bolt-in mounting type with three mounting holes and a threaded stud design, so confirm the original suspension layout matches the listed application. Inspect the surrounding control arm, fasteners, and mounting surfaces for wear or damage before assembly. Because this part does not include a grease fitting, it is a sealed-style service component for the specified fitment.

Quality Assurance

Dorman states that this suspension ball joint is precision-engineered and rigorously tested to provide reliable replacement performance for the original equipment on specific vehicles. Part number 538-770 is built to meet the requirements of the listed Mercedes-Benz applications.