Moog RK621905 Suspension Control Arm and Ball Joint Assembly - Front Upper

OE-Style Front Upper Control Arm

Moog RK621905 is a premium front upper suspension control arm and ball joint assembly for select BMW and Rolls-Royce applications. It is built with forged aluminum for structural strength and corrosion protection, and it arrives pre-greased with bushings and mounting hardware included.

For BMW 640i, 650i, 535i, 550i, 750i, and related models, RK621905 provides a direct-fit front upper suspension service part with OE-style geometry and a press-in ball joint design.

Key Features

• Forged aluminum control arm construction for strength and reduced corrosion exposure
• Pre-greased for ready-to-install service
• Rubber bushings included for suspension isolation
• Press-in ball joint with pinch-style stud design
• Mounting hardware included
• Gray finish
• Non-adjustable OE replacement design
• Moog RK621905 front upper control arm and ball joint assembly

Detailed Description

Moog RK621905 is engineered as a premium OE replacement for front upper suspension service on a wide range of BMW and Rolls-Royce vehicles. The forged aluminum arm helps maintain structural integrity while supporting corrosion resistance, and the included rubber bushings are selected for controlled suspension movement and road isolation. This assembly is pre-greased and uses a press-in ball joint with a pinch stud type, matching the service requirements of the listed applications. This part cross-references Delphi TC3224 for the same application.

Compatible With front upper suspension service on BMW 640i Gran Coupe, BMW 640i xDrive Gran Coupe, BMW 650i Gran Coupe, BMW 650i xDrive Gran Coupe, BMW i8, BMW 640i, BMW 640i xDrive, BMW 650i, BMW 650i xDrive, BMW 535i GT, BMW 535i GT xDrive, BMW 550i GT xDrive, BMW 528i, BMW 528i xDrive, BMW 535d, BMW 535d xDrive, BMW 535i, BMW 535i xDrive, BMW 550i, BMW 550i xDrive, BMW ActiveHybrid 5, BMW 550i GT, BMW 740i, BMW 740Li, BMW 750i, BMW 750i xDrive, BMW 750Li, BMW 750Li xDrive, BMW 760Li, and Rolls-Royce Ghost.

What It Helps Address

• Front-end looseness or play from a worn upper control arm
• Clunking or knocking noises from suspension wear
• Uneven tire wear related to worn ball joint or bushings
• Steering instability or wandering caused by suspension component wear
• Restoration of proper front suspension geometry on listed BMW and Rolls-Royce models

Installation Notes and Tips

Verify the vehicle’s front upper application before installation and compare the arm length and mounting style to the removed part. RK621905 is non-adjustable, so alignment should be checked after installation. The ball joint is a press-in style, and the pinch-type stud connection should be secured according to the vehicle service procedure.

Quality Assurance

Moog premium control arms are engineered for structural strength and corrosion protection on foreign and domestic nameplates. RK621905 is built to OE-style service expectations for the listed BMW and Rolls-Royce applications.