Keep your front suspension tight and precise with the Delphi control arm, MPN TC4389 — a front left lower rearward control arm with an integrated ball joint that locates the wheel, absorbs road inputs, and lets the knuckle pivot for steering. It's a direct-fit replacement for the 2019-2024 BMW 330I, 2020-2024 BMW 330I XDRIVE, 2021-2024 BMW 330E and more; see the Buyer's Guide tab for the full list.
- OE-derived engineering: Delphi applies its OE expertise to the aftermarket, testing parts below -40°C and above 120°C and through 720 hours of salt-spray exposure, with dimensional and material analysis for OE-to-aftermarket compatibility.
- Verified integrity: 100% crack detection and ultrasonic flaw detection help ensure materials match OE specifications.
- Precision ball stud: studs machined to micron tolerances for smooth joint operation and durability.
- Built to last: robot welding for consistent quality, plus anti-corrosion protection applied for corrosion prevention and improved appearance.
This control arm and ball joint assembly combines the arm and ball joint in one unit. Signs the original may need replacing include clunking on acceleration, deceleration, or over uneven roads, loose or wandering steering, and uneven tire wear. If a worn arm or ball joint is the cause, this replaces it; diagnose the cause before ordering.
Interchange: 31 10 6 878 593 · 31 10 6 898 071
31106878593 · 31106898071 · 1028375 · CMS101648 · X05CJ1127
This part cross-references / interchanges with the following part numbers:
31 10 6 878 593, 31 10 6 898 071, 1028375, KSC4464, CMS101648, X05CJ1127
