Keep your front suspension and steering connected with the Delphi ball joint TC4252, a front upper suspension ball joint built as a direct-fit replacement for the listed applications. It fits many vehicles, among them the 2003-2011 Ford Crown Victoria, 2003-2011 Lincoln Town Car and 2003-2011 Mercury Grand Marquis. As the front upper pivot, it connects the upper control arm to the steering knuckle, letting the wheel travel up and down while the front wheels steer. See the "Vehicles it fits" section for the full vehicle list and engine-level details.
- Forged for strength: manufactured with high-quality forgings for increased strength and smooth operation.
- Chloroprene rubber boot: helps improve durability and guard the joint against premature failure.
- Micron-tolerance machining: machined to micron tolerances for durable, smooth joint operation.
- Anti-corrosion protection: applied to each part for corrosion prevention and enhanced aesthetics.
Built on Delphi's OE expertise, these parts are tested to withstand temperatures below -40°C and over 120°C plus 720 hours of salt spray. If a worn front upper ball joint is behind clunking over bumps, uneven tire wear, or loose steering, this replaces it. Replacing the front upper ball joints on both sides together is recommended for even, balanced handling.
Interchange: 539-985 · 4W1Z 3084-RH · 5W1Z 3084-AA
539985 · 4W1Z3084RH · 5W1Z3084AA · 6W1Z3084T · 6W1Z3084U · KBJ4349 · K80272 · MK80272
Product information is for general reference and may contain errors. See our Disclaimer.
This part cross-references / interchanges with the following part numbers:
539-985, 4W1Z 3084-RH, 5W1Z 3084-AA, 6W1Z3084T, 6W1Z3084U, KBJ4349, K80272, MK80272
Frequently Asked Questions
Is this the right ball joint for a 2003-2011 Ford Crown Victoria?
Yes — the TC4252 is listed as a front upper ball joint for the 2003-2011 Ford Crown Victoria. Check the "Vehicles it fits" section to confirm the fit for your specific vehicle.
Is this a front upper Grand Marquis ball joint for the 2003-2011 Mercury Grand Marquis?
Yes, this front upper joint is listed for the 2003-2011 Mercury Grand Marquis. See the "Vehicles it fits" section for the full list of applications.
What is the boot on this ball joint made of?
Delphi fits these ball joints with a chloroprene rubber boot, which helps improve durability and guard the joint against premature failure.
What are the signs of a worn ball joint?
Clunking or knocking over bumps, uneven tire wear, and loose or wandering steering can indicate a worn joint. Have it inspected to confirm the cause before replacing.
Where does this ball joint mount?
It's the front upper ball joint — the pivot connecting the upper control arm to the steering knuckle, allowing the wheel to move up and down while steering.
