Dorman 524-401 Suspension Control Arm and Ball Joint Assembly - Rear Left Forward

Dorman 524-401 Rear Left Forward Control Arm

Dorman 524-401 is a direct replacement suspension control arm and ball joint assembly for specific Lexus applications. It is built for the rear left forward position and is engineered to restore smooth ride quality, directional stability, and predictable handling on the vehicle applications listed below.

Key Features

• Direct replacement for the original equipment control arm and ball joint assembly
• Fits the rear left forward suspension position on select Lexus GS300, GS430, and IS F models
• Pre-greased for immediate service
• Ball joint is included and installed
• Steel control arm construction with rubber bushings
• Pressed attachment design with mounting hardware included
• Black finish for OE-style appearance
• Threaded ball joint stud design

Detailed Description

This suspension control arm assembly is designed for specific Lexus rear suspension applications where OE-style geometry and consistent articulation matter. The steel casting/forged control arm, rubber bushings, and installed ball joint work together to support stable alignment behavior and controlled suspension movement. Dorman 524-401 is a practical replacement choice for drivers servicing a Lexus IS F rear left forward suspension, as well as select 2006 Lexus GS300 and GS430 applications.

This part cross-references Delphi TC7303 for the same application. It also cross-references Mevotech Supreme CMS861054 for the same application. For buyers searching by part number, Dorman 524-401 is the reference to match when replacing the rear left forward control arm on the listed Lexus models.

What It Helps Address

• Clunking or looseness from a worn rear control arm or ball joint
• Uneven rear suspension movement that can affect handling feel
• Directional instability during braking or cornering
• Excess play caused by deteriorated rubber bushings
• Alignment concerns related to worn suspension linkage

Installation Notes and Tips

Verify vehicle fitment by year, model, and rear left forward position before installation. This assembly uses a pressed attachment design and includes the ball joint already installed, which helps streamline replacement of the original suspension link. Because the unit is pre-greased and not greaseable, no grease fitting is provided. Confirm mounting hole diameter, stud dimensions, and suspension layout against the original part before service.

Quality Assurance

Dorman subjects this control arm and ball joint assembly to an industry-focused evaluation process to help support proper ride quality, directional stability, and predictable suspension response. The part is built as a direct replacement for the original equipment on the listed Lexus GS300, GS430, and IS F applications.