Delphi TC7842 Suspension Control Arm and Ball Joint Assembly - Front Left Lower Rearward

OE-Style Front Left Lower Rearward Control Arm

Delphi TC7842 is a suspension control arm and ball joint assembly for the front left lower rearward position. It is built as a standard replacement for select Mercedes-Benz applications, including CL550, S350, S550, and S450 models, with OE-focused dimensional and material analysis for proper fit and function.

For Mercedes-Benz CL550, S350, S550, and S450 owners searching for a front left lower rearward control arm, Delphi TC7842 provides a direct replacement solution with steel construction, a threaded ball joint stud, and pre-greased service-ready assembly details.

Key Features

• Part number: TC7842
• Front left lower rearward suspension control arm and ball joint assembly
• Steel control arm with casting/forged construction
• Pre-greased design
• Bushings included with natural rubber (NR) material
• Mounting hardware included
• Non-adjustable, non-greaseable design
• Black finish
• Threaded ball joint stud
• Standard replacement grade

Detailed Description

Delphi TC7842 is engineered for the front left lower rearward suspension position and built to match OE-style dimensions and materials. Delphi subjects its steering and suspension components to extreme temperature and salt-spray testing, helping verify durability in demanding road conditions. The assembly uses a steel arm with natural rubber bushings and a threaded ball joint stud for a direct-fit replacement approach.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application. It is a strong match for drivers replacing worn suspension hardware on Mercedes-Benz CL550, S350, S550, or S450 models where front-end control arm wear can affect alignment and steering response. Delphi TC7842 is also referenced by OE number A 221 330 77 07.

What This Part Helps Address

• Clunking or knocking from the front suspension
• Excessive play in the lower control arm assembly
• Uneven tire wear caused by worn suspension geometry
• Steering pull or unstable road feel
• Alignment issues after suspension wear

Installation Notes and Tips

Install TC7842 at the front left lower rearward position only. Verify the mounting hole sizes, arm length, and ball joint stud dimensions against the original part before installation. Because this assembly is pre-greased and non-greaseable, no grease fitting is provided. A professional alignment is recommended after replacement to restore suspension geometry.

Quality Assurance

Delphi applies OE-level engineering practices to its aftermarket steering and suspension portfolio, including dimensional and material analysis for fitment consistency. The part is tested for temperature extremes below -40 degrees C and above 120 degrees C, and for extended corrosion exposure through 720 hours of salt spray testing.