Delphi TC4577 Suspension Control Arm and Ball Joint Assembly - Front Left Upper

OE-Style Front Left Upper Control Arm

Delphi TC4577 is a front left upper suspension control arm and ball joint assembly built for direct replacement service on select Tesla models. It combines a steel casting/forged construction with a pre-greased, sealed ball joint and included bushings for a complete front suspension repair.

Compatible with 2017-2023 Tesla 3 and 2020-2023 Tesla Y, front left upper. Delphi applies OE-focused dimensional and material analysis to help maintain proper fit and suspension geometry on Tesla 3 and Tesla Y applications.

Key Features

• Part number TC4577
• Front left upper control arm and ball joint assembly
• Steel construction with painted finish
• Ball joint included with machined mounting type and pinch-style stud
• Pre-greased, non-greaseable design
• Rubber bushings and rubber dust boot included
• Mounting hardware included
• Standard replacement grade
• Black control arm, bushings, and boot components

Detailed Description

Delphi TC4577 is engineered as a direct-fit suspension control arm assembly for the front left upper position. It features a casting/forged steel arm, rubber bushings, a rubber dust boot, and a pre-installed ball joint to simplify front-end service. The assembly is painted for corrosion resistance and is supplied with mounting hardware for installation.

Delphi validates its steering and suspension components through temperature and salt-spray exposure testing, along with dimensional and material analysis, to support OE-style fit and consistent performance. This part cross-references MOOG Chassis Products RK623788 for the same application.

What It Helps Repair

• Clunking or looseness from a worn front upper control arm
• Uneven tire wear caused by suspension play
• Steering wander or reduced front-end stability
• Ball joint noise or binding in the upper control arm assembly
• Rubber bushing deterioration in the front suspension

Installation Notes and Tips

Install TC4577 in the front left upper position only. Verify alignment after replacement, since control arm service can affect camber and toe settings. Confirm the pinch-style ball joint stud and 2-hole mounting pattern match the original Tesla 3 or Tesla Y suspension layout before installation.

Quality Assurance

Delphi uses OE-based engineering standards and extreme-environment testing for its steering and suspension portfolio, including cold-temperature, high-temperature, and salt-spray exposure validation. The TC4577 is built as a standard replacement part for confirmed fitment on 2017-2023 Tesla 3 and 2020-2023 Tesla Y, front left upper.