Delphi TC2978 Suspension Control Arm - Front Left Rearward Lower

OE-Style Front Left Rearward Lower Control Arm

Delphi TC2978 is a suspension control arm built for the front left rearward lower position on select Mercedes-Benz E-Class models. It combines steel and aluminum construction with integrated bushings to support precise suspension geometry and consistent road feel.

Built from casting/forged components and finished in silver, this standard replacement control arm is engineered for direct service on the Mercedes-Benz E250, E350, E400, and E550 applications listed below. Delphi TC2978 is a practical choice when replacing a worn front left rearward lower control arm on an E-Class chassis.

Key Features

• Part number: TC2978
• Suspension control arm for the front left rearward lower position
• Steel and aluminum construction
• Casting/forged design for structural strength
• Includes bushings; ball joint not included
• Press-in ball joint mounting type
• Rubber bearing type with rubber and aluminum bushing material
• Standard replacement grade
• Not adjustable and not pre-greased

Detailed Description

Delphi applies OE-focused dimensional and material analysis to help ensure proper fit and function in the aftermarket. This control arm is tested for extreme temperature exposure and salt-spray resistance as part of Delphi’s OE-oriented validation process, supporting durability in demanding driving conditions. For shoppers searching for a Mercedes-Benz E350 front left rearward lower control arm or a Mercedes-Benz E250 suspension control arm, TC2978 provides a direct replacement solution with the correct mounting style and bushing configuration.

This part cross-references Beck/Arnley 102-7666 for the same application.

What It Helps Fix

• Clunking or knocking from the front suspension
• Excessive play caused by worn control arm bushings
• Uneven tire wear related to suspension geometry issues
• Steering instability or wandering at speed
• Front-end vibration from a deteriorated lower control arm

Installation Notes and Tips

Fits 2014-2016 Mercedes-Benz E250, front left rearward lower. Fits 2010-2016 Mercedes-Benz E350, front left rearward lower. Fits 2013-2016 Mercedes-Benz E400, front left rearward lower. Fits 2010-2011 Mercedes-Benz E550, front left rearward lower.

Confirm the vehicle’s suspension layout and position before installation. Because the ball joint is not included, transfer or replace related components as needed during service. A professional alignment is recommended after control arm replacement to restore proper suspension angles.

Quality Assurance

Delphi manufactures this control arm using OE-focused engineering and validation methods, including dimensional and material analysis for fit consistency. The part is tested across temperature extremes and salt-spray exposure to support long-term service in real-world conditions.