Dorman 538-777 Suspension Ball Joint - Front Lower Rear Inner

Dorman 538-777 Front Lower Rear Inner Ball Joint

Dorman 538-777 is a threaded suspension ball joint engineered as a standard replacement for the original equipment on select Mercedes-Benz models. It is built from steel with a rubber dust boot and mounting hardware included, making it a direct-fit service part for front lower rear inner suspension repair.

Key Features

• Steel construction for suspension service durability
• Threaded ball joint and threaded stud design
• Press-in mounting type for OE-style replacement service
• Rubber dust boot included to help protect the joint
• Standard replacement grade for select Mercedes-Benz front suspension applications
• Mounting hardware included; castle nut, grease fitting, cotter pin, and bushings are not included
• Wrench size: 12 mm

Detailed Description

This Dorman suspension ball joint, part number 538-777, is made for front lower rear inner positions on a wide range of Mercedes-Benz vehicles, including the SL500, SL550, E320, E350, CLS550, S500, and related models. It is a horizontal ball joint application used in the front suspension assembly, with fitment covering model years from 1999 through 2020 depending on the vehicle. This part cross-references Delphi TC2254 for the same application.

Built as a standard replacement, Dorman 538-777 uses a steel body, grey finish, and rubber dust boot to support dependable suspension service. The threaded design and press-in mounting style align with OE-style repair needs for Mercedes-Benz front lower rear inner ball joint replacement.

Common Repair Symptoms

• Front suspension clunking or knocking over bumps
• Excessive play in the lower control arm area
• Uneven tire wear caused by worn suspension joints
• Loose or imprecise steering feel
• Visible dust boot damage or joint wear at the front lower rear inner position

Installation Notes

• Verify the vehicle’s front lower rear inner ball joint position before ordering.
• Confirm threaded and press-in specifications match the original suspension layout.
• Inspect the surrounding control arm and mounting surfaces for wear before installation.
• Use the correct 12 mm wrench size during service.
• Professional installation is recommended for Mercedes-Benz suspension repair.

Quality Assurance

Dorman engineers and tests this replacement ball joint to meet the needs of specific vehicle applications. It is intended as a reliable OE-style service part for Mercedes-Benz suspension repair, with fitment coverage for models such as the SL500, SL550, E-Class, CLS-Class, and S-Class listed above.