Dorman 520-143 Suspension Control Arm - Front Left Upper

Reliable Suspension Control Arm for Buick, Chevrolet, GMC, and More

The Dorman 520-143 suspension control arm is engineered to restore precise handling and suspension performance for select Buick, Chevrolet, GMC, Isuzu, Oldsmobile, and Saab models. Designed with durable steel construction and a coated finish, this control arm offers dependable service for vehicles like the Trailblazer, Envoy, and Ascender.

• Constructed from high-strength steel with casting and forging for durability
• Includes a black rubber bushing with a 14.3 mm inside diameter for effective vibration absorption
• Coated finish resists corrosion and extends part life
• Welded ball joint mounting type with threaded stud (ball joint not included)
• Compatible with multiple GM and related models including Buick Rainier and Chevrolet SSR

Durable Construction and Design Features

This suspension control arm features a robust steel build combining casting and forging processes to ensure structural integrity under demanding driving conditions. The black coated finish provides corrosion resistance, helping maintain performance over time. The included rubber bushing, sized with a 14.3 mm inside diameter and 39.6 mm outside diameter, is designed to reduce noise and absorb road vibrations effectively. The ball joint mounting is welded with a threaded stud type, allowing for secure attachment (note that the ball joint itself is not included). Measuring 262.5 mm in overall length, this control arm fits precisely within the suspension system of compatible vehicles.

Compatible Vehicle Applications

This Dorman 520-143 control arm is compatible with a range of vehicles including Buick 9-7x and Rainier, Chevrolet Trailblazer, Trailblazer EXT, SSR, GMC Envoy, Envoy XL, Envoy XUV, Isuzu Ascender, Oldsmobile Bravada, and Saab 9-7x. It is designed to meet the suspension requirements of these models, ensuring proper fit and function.

Common Suspension Issues Addressed

• Worn or damaged control arm bushings causing steering instability
• Excessive suspension noise or vibration
• Misalignment leading to uneven tire wear
• Loose or compromised ball joint mounting points
• Corrosion or structural fatigue in original control arm

Installation Notes and Tips

Installation of the Dorman 520-143 control arm requires removal of the old control arm and proper alignment of the new part. Since the ball joint is not included, ensure the existing ball joint is inspected and replaced if necessary. Use appropriate torque specifications for mounting bolts and verify bushing seating. This control arm does not include mounting hardware, so retain or source necessary bolts and brackets separately.

Quality Assurance and Warranty

Dorman suspension components are manufactured to meet or exceed OEM standards for fit, form, and function. The 520-143 control arm undergoes rigorous quality checks to ensure durability and performance. While specific warranty details may vary, Dorman typically offers limited warranties covering defects in materials and workmanship.