Delphi TC4527 Suspension Control Arm and Ball Joint Assembly - Rear Left Upper

OE-Style Rear Left Upper Control Arm

Delphi TC4527 is a suspension control arm and ball joint assembly built for rear left upper placement on select Subaru applications. It combines a steel casting/forged construction with a pre-greased ball joint, rubber bushings, and a painted black finish for a direct replacement focused on OE-style fit and function.

Compatible with 2016-2024 Subaru Crosstrek, rear left upper; 2014-2024 Subaru Forester, rear left upper; and 2013-2015 Subaru XV Crosstrek, rear left upper. This part cross-references MOOG Chassis Products RK623524 for the same application.

Key Features

• Delphi part number TC4527
• Rear left upper suspension control arm and ball joint assembly
• Steel control arm with casting/forged construction
• Pre-greased ball joint with grooved stud design
• Rubber bushings and dust boot included
• Painted black finish
• Standard replacement grade
• Designed for power steering applications

Detailed Description

Delphi TC4527 is engineered for Subaru rear suspension service where the control arm and ball joint are replaced as a complete assembly. Delphi applies dimensional and material analysis to help maintain OE-level compatibility, and the part is tested for temperature extremes and extended salt-spray exposure to verify durability in demanding road conditions. The assembly includes a machined ball joint mounting type, chloroprene rubber dust boot, POM bearing material, and rubber bushings to support consistent suspension movement and alignment retention.

For Subaru Crosstrek, Forester, and XV Crosstrek models, TC4527 provides a direct-fit solution for the rear left upper position. The 6.020-inch overall length, 10.030-inch maximum width, and 12.000-inch maximum length help confirm application-specific fitment during parts lookup and service planning.

What This Part Helps Address

• Rear suspension looseness or clunking from worn control arm bushings
• Ball joint play that can affect steering response and wheel control
• Uneven tire wear related to rear suspension geometry issues
• Noise over bumps caused by deteriorated suspension joints
• Alignment instability after wear in the rear left upper suspension link

Installation Notes and Tips

• Verify rear left upper fitment before installation on the vehicle.
• Inspect adjacent suspension hardware and mounting points for wear or damage.
• Because mounting hardware is not included, reuse or source the required fasteners separately.
• After installation, perform a professional alignment check to confirm suspension geometry.
• Confirm the vehicle is one of the listed Subaru Crosstrek, Forester, or XV Crosstrek applications before ordering Delphi TC4527.

Quality Assurance

Delphi uses OE-focused engineering practices for its aftermarket steering and suspension portfolio, including dimensional and material validation for fit consistency. The part is also subjected to temperature and corrosion testing to support dependable service in real-world conditions.