Delphi Suspension Control Arm and Ball Joint Assembly P/N:TC4478
$205.99
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Steady your steering and locate the front wheel precisely with the DELPHI control arm and Ball Joint Assembly TC4478, a front left lower unit built with Delphi's OE-derived engineering. It drops in as a direct-fit replacement for the listed 2014-2021 BMW I3 and 2018-2021 BMW I3S applications — see the Buyer's Guide tab for engine-level fitment. This control arm and ball joint assembly combines the arm and its integrated ball joint into one serviceable corner part.
OE-level validation: tested to the extreme — withstands temperatures below -40°C and over 120°C, plus 720 hours of salt spray, with dimensional and material analysis for close OE-to-aftermarket compatibility.
100% inspected: every arm undergoes crack detection and ultrasonic flaw detection so materials match OE specifications.
Precision ball studs: studs machined to micron tolerances for durable, smooth joint operation.
Robot welding: used for consistent performance and quality.
Anti-corrosion protection applied to each part for corrosion prevention and improved appearance.
Signs this part may need replacing include clunking on acceleration or over uneven pavement, loose or wandering steering, and uneven tire wear traced to a worn ball joint or bushing.
What is the Delphi TC4478 control arm and ball joint assembly?
It's a front left lower suspension control arm with an integrated ball joint that locates the wheel and lets it pivot for steering and travel, supplied as one serviceable corner unit.
Which vehicles does the Delphi TC4478 fit?
It's a direct-fit replacement for the 2014-2021 BMW I3 and 2018-2021 BMW I3S. Check the Buyer's Guide tab to confirm the exact match for your vehicle.
What position is this control arm?
It is the front left lower control arm and ball joint assembly for the listed applications.
What are the signs I need this part?
Clunking on acceleration or over bumps, loose or wandering steering, and uneven tire wear can signal a worn ball joint or bushing. Diagnose the cause before replacing.
How is the Delphi ball joint built for durability?
The ball studs are machined to micron tolerances for smooth operation, arms use robot welding, and each part gets anti-corrosion protection plus 100% crack and ultrasonic flaw detection.
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WARNING:
These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to
www.P65Warnings.ca.gov.
