Delphi TC9398 Suspension Control Arm and Ball Joint Assembly - Front Left Upper

Front Left Upper Control Arm Assembly

Delphi TC9398 is a front left upper suspension control arm and ball joint assembly for select Lexus performance sedans and coupes. It is built for direct replacement on the front left upper position and supports precise suspension geometry on vehicles such as the Lexus IS300, IS350, IS500, RC F, RC300, RC350, GS F, GS350, GS300, GS450h, GS200t, and RC200t.

Delphi applies OE-focused dimensional and material analysis to help ensure proper fit and consistent suspension performance. This part number, TC9398, is engineered for demanding temperature and corrosion exposure testing to support long-term durability in real-world driving conditions.

Key Features

• Front left upper suspension control arm and ball joint assembly
• Direct-fit replacement for select Lexus applications
• OE-style dimensional and material analysis for fit accuracy
• Tested for extreme temperature exposure from below -40°C to over 120°C
• Salt spray tested for 720 hours to evaluate corrosion resistance
• Designed for front suspension service on Lexus IS, RC, and GS platforms

Vehicle Fitment

• Fits 2021-2024 Lexus IS300, front left upper
• Fits 2021-2024 Lexus IS350, front left upper
• Fits 2022-2024 Lexus IS500, front left upper
• Fits 2015-2024 Lexus RC F, front left upper
• Fits 2018-2024 Lexus RC300, front left upper
• Fits 2015-2024 Lexus RC350, front left upper
• Fits 2016-2020 Lexus GS F, front left upper
• Fits 2013-2020 Lexus GS350, front left upper
• Fits 2018-2019 Lexus GS300, front left upper
• Fits 2013-2018 Lexus GS450h, front left upper
• Fits 2016-2017 Lexus GS200t, front left upper
• Fits 2016-2017 Lexus RC200t, front left upper

Common Issues This Part Can Address

• Front-end looseness or wandering caused by worn suspension joints
• Clunking or knocking from the upper control arm area
• Uneven tire wear related to suspension geometry wear
• Steering instability during braking or cornering
• Excess play in the front left upper suspension linkage

Installation Notes and Tips

Confirm the front left upper position before installation and verify vehicle trim and model year against the fitment list. After replacement, a professional wheel alignment is recommended to restore suspension geometry and steering response. This part cross-references MOOG Chassis Products RK623971 for the same application.

Quality Assurance

Delphi uses OE safety technology and aftermarket engineering practices drawn from its original equipment experience. TC9398 is subjected to temperature cycling and extended salt spray testing to help validate durability for front suspension service on Lexus IS, RC, and GS models.