Dorman 527-397 Suspension Control Arm - Front Left Upper

Dorman 527-397 Front Left Upper Control Arm

Dorman 527-397 is a standard replacement suspension control arm for the front left upper position on select Chevrolet and GMC trucks, vans, and motorhome/chassis applications. It is precision-engineered and tested to replace the original equipment control arm on specific vehicles with the correct geometry and mounting style.

Built from steel with a casting/forged construction and a powder-coated black finish, this control arm is made for direct replacement service on vehicles such as the Chevrolet C20, Chevrolet P30, GMC C2500, and GMC P3500. The Dorman 527-397 control arm is listed without a ball joint, bushings, or mounting hardware.

• Front left upper suspension control arm
• Steel construction with casting/forged design
• Powder-coated black finish for added surface protection
• Standard replacement grade for OE-style service
• Ball joint mounting type: bolt-in
• Rubber bushing material with black bushings
• Not pre-greased and no grease fitting included
• Compatible with select Chevrolet and GMC applications from 1971-2002

Detailed Product Overview

This suspension control arm is designed for vehicles that need a direct OE-style front left upper arm replacement without a ball joint installed. It uses a straight shape, threaded ball joint stud type, and rubber bushings with a 14.3 mm inside diameter and 39.6 mm outside diameter. The Dorman 527-397 is a practical replacement for worn or damaged upper control arms on Chevrolet and GMC platforms, including Chevrolet P20, Chevrolet G30, GMC G3500, and GMC C3500 applications.

This part cross-references MOOG Chassis Products RK622888 for the same application.

Common Problems This Part Addresses

• Excessive front-end looseness or wandering
• Uneven tire wear caused by worn suspension geometry
• Clunking or knocking from a damaged upper control arm
• Failed or deteriorated control arm bushings
• Restoring alignment stability after suspension wear

Installation Notes and Tips

Verify vehicle year, make, model, and front left upper position before ordering. This part is listed for applications without a ball joint, so transfer or source the correct ball joint separately if required by the vehicle setup. Confirm whether your Chevrolet or GMC application is equipped with heavy-duty suspension, heavy-duty air suspension, or motorhome chassis equipment, since those notes affect fitment.

Professional installation and a post-repair alignment are recommended after replacement. Inspect related suspension components, including bushings, steering linkage, and mounting points, before final assembly.

Quality Assurance

Dorman states this control arm is precision-engineered and rigorously tested to provide reliable replacement performance for the original equipment part on specific vehicles. It is built as a standard replacement component for consistent fit and service on confirmed applications.