Delphi TC3658 Suspension Control Arm and Ball Joint Assembly - Front Left Lower Rearward

Delphi Suspension Control Arm and Ball Joint Assembly Overview

The Delphi TC3658 suspension control arm and ball joint assembly is designed for front left lower rearward positions on select Audi models. Engineered with durable aluminum construction and natural rubber bushings, this assembly provides reliable suspension performance for Audi A4, A4 Quattro, A5, A5 Quattro, Q5, S4, and S5 vehicles.

• Pre-greased for immediate installation
• Aluminum control arm with casting and forged construction
• Natural rubber bushings included for vibration dampening
• Threaded ball joint stud measuring 3.071 inches in length
• Standard replacement grade for front left lower rearward suspension
• Gray finish with one mounting hole (12.2 mm diameter)
• Mounting hardware included for secure fitment

Technical Details of Delphi TC3658 Control Arm

This suspension control arm assembly features a robust aluminum control arm constructed through casting and forging processes, ensuring strength and durability while maintaining a lightweight profile. The natural rubber bushings help absorb road vibrations and reduce noise, contributing to a smoother ride. The ball joint stud is threaded and measures approximately 78 mm (3.071 inches) in length, designed to fit securely within the suspension system. The control arm’s maximum width is 187 mm (7.362 inches), and its length extends to 498 mm, providing precise fitment for the specified Audi models.

Compatible Audi Models and Applications

The Delphi TC3658 is compatible with the following Audi vehicles:

• Audi A4 and A4 Quattro
• Audi A5 and A5 Quattro
• Audi Q5
• Audi S4
• Audi S5

This part is specifically designed for the front left lower rearward suspension position, ensuring proper alignment and handling characteristics for these models.

Common Suspension Issues Addressed

• Worn or damaged control arm bushings causing excessive vibration
• Loose or failing ball joints leading to steering instability
• Corroded or cracked control arms affecting suspension geometry
• Uneven tire wear due to suspension misalignment
• Noise or clunking sounds from front suspension components

Installation Notes and Tips

Before installation, verify the part number TC3658 matches your vehicle’s requirements. The assembly comes pre-greased and includes bushings and mounting hardware for a streamlined replacement process. Although grease fittings are not included, the pre-lubricated ball joint and bushings reduce maintenance needs. Proper torque specifications should be followed to ensure secure mounting and optimal suspension performance.

Quality Assurance and Warranty

Delphi suspension components meet standard replacement grade specifications, providing reliable performance and durability. The TC3658 control arm assembly undergoes rigorous quality control to ensure fitment accuracy and material integrity. Warranty coverage details should be confirmed with the parts provider or manufacturer documentation.