Moog RK621976 Suspension Control Arm and Ball Joint Assembly - Front Left Lower Rearward

BMW Front Left Lower Rearward Control Arm

The Moog RK621976 is a suspension control arm and ball joint assembly for select BMW applications, including 3 Series and 4 Series models. It is built for the front left lower rearward position and uses a press-in ball joint with a threaded stud for a direct-fit suspension repair.

Key Features

• Moog suspension control arm and ball joint assembly for foreign and domestic nameplates
• Fits the front left lower rearward position on select BMW 228i, 320i, 328i, 330i, 430i, and related models
• Press-in ball joint mounting type with threaded ball joint stud
• Bushings included with rubber bushing material
• No grease fitting included
• Non-adjustable design for OE-style suspension service
• Control arm maximum length: 11.880

Detailed Description

Moog RK621976 is engineered for structural strength and corrosion protection, making it a practical replacement for worn front suspension components on BMW 2 Series, 3 Series, and 4 Series vehicles. This part number is commonly searched as RK621976 and is used for the front left lower rearward control arm position on applications such as the BMW 328i, BMW 430i Gran Coupe, and BMW 335i. It is also a direct-reference replacement for select OE-style applications, including Dorman OE Solutions 522-879 and Mevotech Supreme CMS101309.

With included rubber bushings and a press-in ball joint design, this assembly is built to restore suspension geometry and steering response where the original control arm has worn, loosened, or developed play. The Moog RK621976 supports a clean replacement path for BMW front suspension service without requiring an adjustable setup.

What It Helps Fix

• Front-end clunking or knocking from a worn control arm assembly
• Excessive suspension play at the front left lower rearward position
• Uneven tire wear caused by worn bushings or ball joint wear
• Steering wander or reduced directional stability
• Suspension noise during braking, turning, or road impacts

Installation Notes and Tips

Fits 2012-2016 BMW 328i, front left lower rearward; 2014-2016 BMW 428i, front left lower rearward; 2017-2019 BMW 430i, front left lower rearward; and other listed BMW applications in the same position. Verify the vehicle year, model, and front left lower rearward location before installation. Because the ball joint is press-in, proper suspension service tools and alignment procedures are recommended after replacement. This part number is RK621976.

Quality Assurance

Moog premium control arms are engineered for structural strength and corrosion protection. The RK621976 is built to meet OEM-standard expectations for the listed BMW applications and is backed by Moog’s reputation in suspension replacement parts.