Dorman 520-947 Suspension Control Arm and Ball Joint Assembly - Rear Left Upper

Dorman 520-947 Rear Left Upper Control Arm

Dorman 520-947 is a direct replacement suspension control arm and ball joint assembly for specific Mercedes-Benz applications. It is built for the rear left upper position and is engineered to restore smooth ride quality, directional stability, and predictable suspension response.

• Direct replacement for the original equipment control arm and ball joint assembly
• Fits the rear left upper suspension position on select Mercedes-Benz ML-Class models
• Aluminum control arm construction with black finish
• Ball joint is installed and pre-greased
• Rubber bushings included for suspension mounting support
• Press-in ball joint mounting with threaded stud design
• Mounting hardware included

Application Details

Compatible with 1998-2003 Mercedes-Benz ML320, rear left upper; 1999-2001 Mercedes-Benz ML430, rear left upper; 2000-2003 Mercedes-Benz ML55 AMG, rear left upper; 2002-2005 Mercedes-Benz ML500, rear left upper; and 2003-2005 Mercedes-Benz ML350, rear left upper. This Dorman 520-947 assembly is a practical OE-style replacement for Mercedes-Benz ML320 rear left upper control arm and ball joint service, as well as ML500 and ML350 rear suspension repairs.

The aluminum casting/forged control arm is paired with a press-in ball joint and rubber bushings to match the original suspension layout. The assembly is pre-greased, the ball joint is already installed, and the included mounting hardware supports a cleaner replacement process. This part cross-references Delphi TC2137 for the same application.

Common Repair Symptoms

• Rear suspension looseness or clunking over bumps
• Uneven tire wear from worn rear control arm bushings or ball joint wear
• Reduced directional stability during highway driving
• Suspension noise from a deteriorated upper control arm assembly
• Imprecise rear suspension geometry after component wear

Installation Notes

Verify the rear left upper position before installation and confirm vehicle fitment by year, model, and suspension configuration. Because the ball joint is installed and the assembly is pre-greased, replacement focuses on removing the worn OE unit and installing the new control arm in the correct orientation. Torque all fasteners to factory specifications and perform a wheel alignment after service.

Quality Assurance

Dorman evaluates this suspension control arm and ball joint assembly through an industry-focused validation process to support proper ride quality, stability, and suspension behavior. The design follows direct-replacement requirements for specific Mercedes-Benz ML-Class applications, including ML320, ML430, ML55 AMG, ML500, and ML350 models.