Dorman 521-979 Suspension Trailing Arm - Rear Upper

Durable Suspension Trailing Arm for Buick, Chevrolet, GMC, and Oldsmobile

The Dorman 521-979 suspension trailing arm is engineered to provide reliable support and stability for your vehicle's rear suspension system. Designed specifically for select Buick, Chevrolet, GMC, and Oldsmobile models, this trailing arm ensures proper alignment and handling performance.

• Constructed from high-strength steel with a coated finish for corrosion resistance
• Includes black rubber bushings for effective vibration dampening
• Length of 262.5 mm to match OEM specifications
• Press-in type on one end for secure installation
• Welded attachment type for enhanced durability
• Compatible with Buick Bravada, Chevrolet Trailblazer, GMC Envoy, Oldsmobile SSR, and Rainier
• Part number 521-979 for precise identification

Product Details and Specifications

This Dorman suspension trailing arm is made from durable steel and features a coated black finish to resist rust and wear. The included rubber bushings, also black in color, help absorb road vibrations and reduce noise, contributing to a smoother ride. Measuring 262.5 mm in length, this trailing arm matches the original equipment dimensions to maintain proper suspension geometry. The press-in end type ensures a tight fit during installation, while the welded attachment type adds strength to the component. This part is designed as a regular grade, non-adjustable control arm casting/forged type, without ball joints or grease fittings included.

Compatible Vehicles and Applications

This suspension trailing arm is compatible with the following vehicles:

• Buick Bravada
• Chevrolet Trailblazer
• GMC Envoy
• Oldsmobile SSR
• Oldsmobile Rainier

Use part number 521-979 to ensure compatibility with your specific model and year.

Common Issues Addressed by This Trailing Arm

• Excessive rear suspension play or looseness
• Uneven tire wear due to misalignment
• Clunking or knocking noises from the rear suspension
• Reduced handling stability and control
• Vibration or harshness during driving

Installation Notes and Tips

• Verify vehicle compatibility using make, model, and part number before installation
• Inspect mounting points and hardware for wear or damage prior to installation
• Use appropriate tools to press in bushings securely
• Torque all fasteners to manufacturer specifications
• Alignment check is recommended after installation to ensure proper suspension geometry

Quality Assurance and Warranty

Dorman suspension components are manufactured to meet or exceed OEM standards for fit, form, and function. The 521-979 trailing arm undergoes rigorous quality control to ensure durability and performance. While specific warranty details may vary, Dorman typically offers limited warranties covering defects in materials and workmanship. Consult product documentation for exact warranty terms.