Delphi TC8404 Suspension Control Arm - Rear Upper Forward

OE-Style Rear Upper Forward Control Arm

Delphi TC8404 is a suspension control arm for the rear upper forward position on select Audi and Porsche applications. Built with an aluminum arm, painted finish, and rubber bushings, it is a standard replacement part for restoring rear suspension geometry and ride control.

Delphi applies OE-level dimensional and material analysis to help ensure proper fitment and consistent performance. This part is tested for extreme temperature exposure and salt spray resistance, supporting dependable operation in demanding road conditions.

Key Features

• Part number: TC8404
• Suspension control arm for the rear upper forward position
• Aluminum construction with a painted finish
• Rubber bushings included; black bushing color
• Standard replacement grade, non-adjustable design
• Bent arm shape with casting/forged construction
• Pre-greased: No
• Grease fitting included: No
• Mounting hardware included: No

Detailed Description

Delphi TC8404 is engineered as a rear upper forward suspension control arm for Audi Q5, Q7, Q8, A6 Quattro, A7 Sportback, e-tron models, S and RS variants, and Porsche Cayenne applications listed below. The aluminum arm and rubber bushings are specified for OE-style replacement needs, while Delphi’s dimensional and material analysis helps support correct alignment and part compatibility. This part cross-references LA12556 for the same application.

Compatible With 2017-2023 Audi Q7, rear upper forward; 2018-2024 Audi Q5, rear upper forward; 2019-2024 Audi A6 Quattro, rear upper forward; and 2019-2025 Porsche Cayenne, rear upper forward. Delphi TC8404 is also listed for multiple Audi e-tron, Q8, S, SQ, and RS applications in the same rear upper forward position.

What It Helps Address

• Rear suspension looseness or clunking from worn bushings
• Uneven tire wear caused by worn control arm components
• Imprecise rear suspension geometry after component wear
• Noise or vibration from deteriorated rubber bushings
• Restoration of rear upper forward suspension support on listed vehicles

Installation Notes

• Verify vehicle fitment by year, make, model, and rear upper forward position before installation.
• Inspect adjacent suspension components, fasteners, and alignment settings during replacement.
• Because mounting hardware is not included, reuse or replace hardware as required by the vehicle service procedure.
• Professional alignment is recommended after control arm replacement.

Quality Assurance

Delphi uses OE-focused engineering and validation methods for its aftermarket steering and suspension portfolio. TC8404 is subjected to temperature extremes below -40 degrees C and above 120 degrees C, along with 720 hours of salt spray testing, to support durability in real-world conditions.