Delphi TC4257 Suspension Ball Joint - Front Upper

Delphi TC4257 Front Upper Ball Joint

Delphi TC4257 is a standard replacement suspension ball joint for the front upper position on select Ford, Mercury applications. Built with OE-focused dimensional and material analysis, it is made for direct replacement service on vehicles that need precise steering and suspension articulation.

Compatible with 2006-2010 Ford Explorer, 2007-2010 Ford Explorer Sport Trac, and 2006-2010 Mercury Mountaineer in the front upper position, this Delphi ball joint is pre-greased and supplied as a complete ball joint assembly with a dust boot and mounting hardware.

Key Features

• Part number: TC4257
• Front upper suspension ball joint
• Standard replacement grade
• Pre-greased for service-ready installation
• Press-in mounting type
• Thread direction: counterclockwise (left)
• Dust boot material: rubber
• Ball joint assembly included
• Mounting hardware included
• Power steering application
• Threaded, tapered stud design

Detailed Description

Delphi TC4257 is engineered for the front upper suspension location and built to match OE-style fit and function for the Ford Explorer, Ford Explorer Sport Trac, and Mercury Mountaineer. Delphi applies dimensional and material analysis to help ensure proper compatibility between the original part and the aftermarket replacement, while the ball joint is tested across extreme temperature ranges and salt-spray exposure to support durability in demanding road conditions. The design includes a plastic bearing type, rubber dust boot, and pre-greased construction for straightforward replacement service.

This part cross-references MOOG Chassis Products K500014 and Mevotech Supreme MK500014 for the same application.

What It Helps Address

• Front-end looseness from a worn upper ball joint
• Clunking or popping noises from suspension movement
• Uneven steering response caused by joint wear
• Excess play in the front upper suspension connection
• Inspection failures related to suspension joint condition

Installation Notes and Tips

TC4257 uses a press-in mounting design, so proper suspension service tools are required for removal and installation. Confirm the counterclockwise left thread direction, tapered stud dimensions, and front upper position before installation. Always verify vehicle application by year, make, model, and suspension configuration before service.

Quality Assurance

Delphi uses OE-based engineering and validation methods for its steering and suspension portfolio. This ball joint is evaluated for temperature extremes and corrosion exposure to support consistent performance in everyday driving and harsh-weather conditions.

• Fits 2006-2010 Ford Explorer, Front Upper
• Fits 2007-2010 Ford Explorer Sport Trac, Front Upper
• Fits 2006-2010 Mercury Mountaineer, Front Upper