Dorman 520-978 Suspension Control Arm and Ball Joint Assembly - Front Lower Forward

Dorman 520-978 Suspension Control Arm Assembly

Dorman 520-978 is a direct replacement suspension control arm and ball joint assembly for specific Audi applications. It is built to help restore smooth ride quality, directional stability, and predictable suspension response on the front lower forward position.

• Direct replacement for original equipment fitment on select vehicles
• Pre-greased for immediate service
• Steel control arm construction with black finish
• Ball joint included and installed
• Rubber bushings included
• Mounting hardware included
• Threaded ball joint stud with 14 mm thread diameter
• Pressed attachment type for OE-style installation

This Dorman 520-978 assembly is engineered for the front lower forward suspension position on 2005-2011 Audi A6, 2005-2011 Audi A6 Quattro, and 2007-2011 Audi S6. It combines the control arm, bushings, and ball joint in one service part to simplify replacement of worn suspension components while maintaining the original vehicle geometry. This part cross-references Delphi TC1878 for the same application.

Common Repair Symptoms

• Clunking or knocking from the front suspension
• Loose or wandering steering feel
• Uneven tire wear caused by worn suspension joints
• Excessive play in the front lower forward control arm
• Reduced ride stability over bumps and road irregularities

Installation Notes

Verify vehicle application by year, make, model, and front lower forward position before installation. Inspect adjacent suspension components, fasteners, and alignment settings during service. Because the ball joint is installed and the assembly is pre-greased, this part is ready for replacement once the original component is removed and the mounting points are prepared.

Quality Assurance

Dorman uses an industry-focused evaluation process to help ensure consistent ride quality, directional stability, and predictable suspension dynamics. The steel casting/forged construction, rubber bushings, and OE-style replacement design support dependable service on Audi A6, Audi A6 Quattro, and Audi S6 front suspension repairs.