Delphi TC8403 Suspension Control Arm and Ball Joint Assembly - Front Left Lower Forward

OE-Style Front Left Lower Forward Control Arm

Delphi TC8403 is a suspension control arm and ball joint assembly for the front left lower forward position. It is built for Mercedes-Benz S-Class applications that need a direct replacement with OE-focused dimensions, materials, and pre-greased service readiness.

For Mercedes-Benz S550, S600, S450, and S560 models, this Delphi TC8403 assembly supports precise front suspension geometry and consistent steering response. It is also a fitment match for select Maybach S600 and Maybach S650 applications in the same front left lower forward location.

Key Features

• Part number: TC8403
• Front left lower forward suspension control arm and ball joint assembly
• Pre-greased for service-ready installation
• Ball joint included
• Bushings included with rubber bushing material
• Dust boot included with chloroprene rubber construction
• Mounting hardware included
• Premium grade type
• Clockwise (right) thread direction
• Power steering type application

Detailed Description

Delphi applies OE-level dimensional and material analysis to this suspension assembly to help maintain proper fit and function in the aftermarket. The TC8403 is engineered with black rubber bushings, a chloroprene rubber dust boot, and a pre-greased ball joint to support smooth articulation and long-term suspension service. Delphi also subjects its steering and suspension components to extreme temperature exposure and extended salt-spray testing to evaluate durability under demanding conditions.

This part cross-references Dorman OE Solutions 526-275 for the same application. It is a direct replacement choice for Mercedes-Benz S550, S600, S450, and S560 front suspension service where the front left lower forward control arm and ball joint assembly must match OE-style geometry.

Common Repair Uses

• Restoring worn front suspension control arm and ball joint function
• Addressing clunking or looseness from degraded bushings
• Correcting steering feel affected by front suspension wear
• Replacing a damaged dust boot or ball joint assembly
• Servicing front left lower forward suspension components on Mercedes-Benz S-Class and Maybach models

Installation Notes

Verify the front left lower forward position before installation and confirm thread direction, mounting hole diameter, and steering type against the original part. Because this assembly includes bushings, a dust boot, a ball joint, and mounting hardware, it is suited to a complete replacement of the worn unit rather than a partial rebuild.

• Fits 2018-2020 Mercedes-Benz S450, front left lower forward
• Fits 2018-2020 Mercedes-Benz S560, front left lower forward
• Fits 2019-2020 Mercedes-Benz S560e, front left lower forward
• Fits 2018-2019 Mercedes-Benz Maybach S650, front left lower forward
• Fits 2016-2017 Mercedes-Benz Maybach S600, front left lower forward
• Fits 2014-2017 Mercedes-Benz S550, front left lower forward
• Fits 2015-2017 Mercedes-Benz S550e, front left lower forward
• Fits 2015-2017 Mercedes-Benz S600, front left lower forward

Quality Assurance

Delphi uses OE-focused testing and material validation for its steering and suspension portfolio, including temperature cycling and salt-spray exposure, to support consistent performance and fit. The TC8403 is built as a premium replacement assembly for Mercedes-Benz and Maybach front suspension service.