Delphi TC8421 Suspension Control Arm - Rear Left Lower Rearward

Delphi TC8421 Rear Left Lower Rearward Control Arm

Delphi TC8421 is a suspension control arm built for the rear left lower rearward position on select Mercedes-Benz models. It combines a steel, bent-arm design with rubber bushings and a painted finish for standard replacement service on the CL600, CL63 AMG, CL65 AMG, S600, S63 AMG, and S65 AMG.

Key Features

• Part number: TC8421
• Rear left lower rearward suspension control arm
• Steel construction with casting/forged manufacturing
• Black painted finish
• Rubber bushings included
• Standard replacement grade
• Non-adjustable and non-greaseable design
• No pre-greasing and no grease fitting included
• Compatible with Mercedes-Benz OE reference 221 350 17 06

Detailed Description

Delphi applies OE-focused dimensional and material analysis to this control arm to support proper fit and suspension geometry on Mercedes-Benz CL600, CL63 AMG, CL65 AMG, S600, S63 AMG, and S65 AMG applications. The TC8421 uses a steel body with a bent shape, black rubber bushings, and a painted surface finish, making it a direct replacement choice for the rear left lower rearward position. This part cross-references Mercedes-Benz OE number 221 350 17 06 for the same application. Delphi TC8421 is a practical option when replacing a worn rear suspension control arm on Mercedes-Benz CL600 and S-Class models.

What This Part Helps Address

• Excessive rear suspension play or looseness
• Clunking or knocking from the rear suspension area
• Uneven tire wear caused by worn control arm bushings
• Imprecise rear suspension alignment
• Handling instability from deteriorated rear control arm components

Installation Notes and Tips

Install Delphi TC8421 in the rear left lower rearward position only. Verify the vehicle application against the listed Mercedes-Benz fitment before installation, and inspect adjacent suspension components, bushings, and alignment settings during service. Because this control arm is not adjustable and does not include mounting hardware, reuse or source the correct hardware as required by the vehicle service procedure. A professional alignment is recommended after replacement.

Quality Assurance

Delphi subjects its OE-based steering and suspension components to temperature extremes below -40 degrees C and above 120 degrees C, along with extended salt-spray exposure testing. That validation process supports material durability and dimensional consistency for Mercedes-Benz rear suspension service.

Compatible Vehicles

• Fits 2007-2014 Mercedes-Benz CL600, rear left lower rearward
• Fits 2011-2014 Mercedes-Benz CL63 AMG, rear left lower rearward
• Fits 2008-2014 Mercedes-Benz CL65 AMG, rear left lower rearward
• Fits 2007-2013 Mercedes-Benz S600, rear left lower rearward
• Fits 2011-2013 Mercedes-Benz S63 AMG, rear left lower rearward
• Fits 2007-2013 Mercedes-Benz S65 AMG, rear left lower rearward