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          Moog RK621978 - Suspension Control Arm and Ball Joint Assembly (Front Right Lower Forward)

          MPN: RK621978
          The Moog RK621978 Suspension Control Arm and Ball Joint Assembly enhances stability and handling in your BMW. Designed for easy installation and long-lasting performance.
          0.0
          Vehicle Specific
          Check if this part fits your vehicle.
          • $83.95
          In stock

          Product Overview

          The Moog Suspension Control Arm and Ball Joint Assembly part number RK621978 is engineered to provide superior performance and durability for your BMW. This premium-grade replacement part is crafted from high-quality materials, ensuring it withstands extreme driving conditions while delivering reliable performance. Designed to replace worn-out or damaged suspension components, this assembly guarantees a precise fit and easy installation, making it an ideal choice for DIY enthusiasts and professional technicians alike. Choose Moog RK621978 for dependable performance and peace of mind every time you service your vehicle.

          Cross Reference Numbers

          This Moog RK621978 is equivalent to or replaces the following part numbers: 1027663, 31126855742, 522-882, 45092, CB14474, CMS101306, JTC1624.

          Vehicle Compatibility

          • BMW 230i 2.0L4 (2016–2019)
          • BMW 320i 2.0L4 (2014–2019)
          • BMW 328d 2.0L4 (2014–2019)
          • BMW 328i 2.0L4 (2013–2016)
          • BMW 330i 2.0L4 (2017–2019)
          • BMW 330e 2.0L4 (2016–2019)
          • BMW 340i 3.0L6 (2016–2019)
          • BMW 428i 2.0L4 (2014–2016)
          • BMW 430i 2.0L4 (2017–2019)
          • BMW M240i 3.0L6 (2017–2019)

          This may also fit other applications. Please use the vehicle selector tool to verify fitment.

          Why Shop at eEuroparts.com?

          • Proven Expertise: Over 25 years of experience with European vehicles means we know your car inside and out.
          • Exclusive Kits That Fitâ„¢ - complete repair solutions with no guesswork
          • Fitment Confidence: Our accurate cataloging ensures you get the right part the first time.
          • Fast, Reliable Shipping: Orders ship quickly from our U.S.-based warehouses.
          • Transparent Pricing: Competitive prices with no hidden fees or surprise charges.
          • Established Trust: Serving the European auto community since 2000.

          Frequently Asked Questions

          What does the Moog RK621978 Suspension Control Arm and Ball Joint Assembly do?

          The Suspension Control Arm and Ball Joint Assembly is a crucial component of your vehicle's suspension system, providing stability and support for the wheels. It helps maintain proper alignment and enhances handling performance, ensuring a smooth and safe driving experience.

          How do I know if my Suspension Control Arm needs replacement?

          Common signs that your suspension control arm may need replacement include uneven tire wear, a clunking noise while driving over bumps, vehicle pulling to one side, and a noticeable decrease in ride quality.

          Can I install the Moog RK621978 myself?

          Yes, the Moog RK621978 can be installed by DIY enthusiasts, but it is important to follow proper procedures and safety precautions to ensure correct installation and function.

          What are the symptoms of a faulty Suspension Control Arm?

          A faulty suspension control arm may cause poor handling, increased tire wear, clunking sounds on rough roads, and misalignment issues. If you experience these symptoms, it is advisable to inspect the control arm for damage.

          Why should I choose Moog for my Suspension Control Arm needs?

          Moog is known for its quality and reliability in the automotive parts industry. Order Moog RK621978 today for a factory-correct replacement that restores safety and performance.

          Note: All information on this page and in the FAQ is for general reference only. Verify fitment and consult a professional as needed. eEuroparts.com is not responsible for incorrect part selection or installation.

            • eEuroparts SKU
              170268
            • Weight
              10 lbs
            • Dimensions (L x W x H)
              5.5 x 19 x 24 in
            • Barcode
              80066048062
            • Manufacturer Part #
              RK621978
          • Brand
            Moog
          • Manufacturer
            Moog
          • MPN
            RK621978
          • Part Type
            Suspension Control Arm and Ball Joint Assembly
          • Position
            Front Right Lower Forward
          • OE Part Numbers
            31126855742
          • Cross Reference Numbers
            QSJ3640S, CA4976, 522-882, 522882, 45092, JTC1624, CMS101306, 1027663, CB14474
          • Features
            Adjustable : No
            Ball Joint Mounting Type : Press In
            Ball Joint Stud Type : Threaded
            Bushing Material : Rubber
            Bushings Included : Yes
            Control Arm Maximum Length : 15.460
            Grease Fitting Included : No
          • Fitment
            • Fitment Type
              Vehicle Specific
          YearMakeModelSubmodelNotes
          2014BMW228iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2014BMW320iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2014BMW328iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2014BMWActiveHybrid 3Base (3.0 L6 FHEV)Notes: TENSION STRUT Type
          2014BMW428iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2014BMW435iBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2014BMW328dBase (2.0 L4 DIESEL)Notes: TENSION STRUT Type
          2014BMWM235iBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2014BMW335iBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2015BMW228iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2015BMW320iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2015BMW328iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2015BMWActiveHybrid 3Base (3.0 L6 FHEV)Notes: TENSION STRUT Type
          2015BMW428iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2015BMW435iBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2015BMW328dBase (2.0 L4 DIESEL)Notes: TENSION STRUT Type
          2015BMWM235iBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2015BMW428i Gran CoupeBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2015BMW435i Gran CoupeBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2015BMW228i xDriveBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2015BMW335iBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2016BMW228iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2016BMW320iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2016BMW328iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2016BMW428iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2016BMW435iBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2016BMW328dBase (2.0 L4 DIESEL)Notes: TENSION STRUT Type
          2016BMWM235iBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2016BMW428i Gran CoupeBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2016BMW435i Gran CoupeBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2016BMW228i xDriveBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2016BMW340iBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2016BMW330eBase (2.0 L4 PHEV)Notes: TENSION STRUT Type
          2017BMW430iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2017BMW320iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2017BMW330iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2017BMW328dBase (2.0 L4 DIESEL)Notes: TENSION STRUT Type
          2017BMW340iBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2017BMW330eiPerformance (2.0 L4 PHEV)Notes: TENSION STRUT Type
          2017BMWM240iBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2017BMW230iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2017BMW440iBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2017BMW440i Gran CoupeBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2017BMW430i Gran CoupeBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2018BMW430iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2018BMW320iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2018BMW330iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2018BMW328dBase (2.0 L4 DIESEL)Notes: TENSION STRUT Type
          2018BMW340iBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2018BMW330eBase (2.0 L4 PHEV)Notes: TENSION STRUT Type
          2018BMWM240iBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2018BMW230iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2018BMW440iBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2018BMW440i Gran CoupeBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2018BMW430i Gran CoupeBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2019BMW430iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2019BMWM240iBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2019BMW230iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2019BMW440iBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2019BMW440i Gran CoupeBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2019BMW430i Gran CoupeBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2020BMW430iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2020BMWM240iBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2020BMW230iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2020BMW440iBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2020BMW440i Gran CoupeBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2020BMW430i Gran CoupeBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2013BMW320iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2013BMW328iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2013BMWActiveHybrid 3Base (3.0 L6 FHEV)Notes: TENSION STRUT Type
          2013BMW335iBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2012BMW328iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
          2012BMW335iBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2021BMWM240iBase (3.0 L6 GAS)Notes: TENSION STRUT Type
          2021BMW230iBase (2.0 L4 GAS)Notes: TENSION STRUT Type
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          Warranty Overview

          At eEuroparts, we stand behind the quality of the products we sell. Every part we offer is backed by a warranty designed to give you peace of mind and protect your investment.

          Standard Warranty – Most Parts

          • Coverage: 2 years or 24,000 miles (whichever comes first) from purchase date.

          • Protection: Defects in materials or workmanship under normal personal use.

          • Eligibility: Applies only to the original purchaser and the vehicle where the part was first installed.

          • Exclusions:

            • Wear-and-tear items (brake pads, filters, bulbs, wipers, etc.)

            • Commercial, fleet, rideshare, off-road, or racing use

            • Improper installation, misuse, accidents, or modifications

          • Not Covered: Labor, shipping, towing, or incidental costs.

          Bison Performance Warranty – Our House Brand

          • Coverage: Limited Lifetime Warranty for as long as you own your vehicle.

          • Applies To: All products sold under the Bison Performance label.

          • Premium Protection: Goes beyond our standard warranty — if it’s a Bison product, the 2-year/24k mile limit is replaced with lifetime coverage.

          • Exclusions: Same as the standard warranty (normal wear, commercial use, improper installation, etc.).

          • What’s Included: Replacement of the defective product (labor and shipping excluded).

          Warranty Claim Requirements

          To keep claims fast and fair, we require:

          • Proof of purchase (invoice or order confirmation).

          • Photos or videos showing the defective part, order number, date, VIN, and odometer reading.

          • Diagnostic reports or part returns for non-visible issues may be requested.

          • Claims must be truthful, properly documented, and reflect normal consumer use.

          Buy With Confidence: We back our products because we believe in their quality, with a transparent, customer-first warranty process you can trust. And with Bison Performance products, you’ll enjoy Limited Lifetime protection—an assurance few brands can match.

          For full details and exclusions, please see our complete Warranty Terms & Conditions.

          This summary is for convenience only. For full warranty coverage details, exclusions, and requirements, see our official Warranty Terms & Conditions. In case of conflict, the full policy governs.

          Return Policy Overview

          Most parts can be returned within 30 days of delivery if unused, uninstalled, and in original packaging.
          To start a return, contact customer support via Chat or Contact Us.

          • Restocking fee: Up to 20% may apply for certain orders (buyer’s remorse, order errors, or special-order items)

          • Refunds: Issued to your original payment method within 3–5 business days after inspection

          • Exchanges: Not automatic — please return and reorder

          • Replacements: May be approved for incorrect or defective items reported within 7 days

          Not returnable:

          • Used or installed parts

          • Electrical components

          • Opened filter kits, gaskets, or contaminated items

          • Final sale or custom orders

          Important Notes:

          • Return shipping is your responsibility unless we made a verified error

          • Fitment is the customer’s responsibility (we can assist, but do not guarantee)

          • Country of origin may vary and is not grounds for return

          For complete details, please see our full Return Policy.


          This Returns summary is provided for convenience only. All returns, refunds, and exchanges are subject to the complete Returns Policy. In the event of any conflict, the full policy governs.

          Fast, Reliable Shipping — Straight to Your Door

          We ship most orders the same day when placed before 2 PM CST (Monday–Friday). Our main warehouse is just east of Nashville, TN, and we also ship from multiple locations nationwide to get your order to you as quickly as possible.

          • We use trusted carriers like UPS, FedEx, and USPS.

          • Tracking info is emailed to you as soon as your order ships.

          • Delivery estimates at checkout are based on carrier data, but not guaranteed.

          Need help with a shipment?

          If your order is missing, damaged, or incorrect, just let us know within 5 days of delivery. We’ll walk you through the quick claim process — including a few photos to help us make things right.

          For complete details, please see our full Shipping Policy.


          This Shipping summary is provided for convenience only. Delivery times, carrier terms, fees, restrictions, risk of loss, and other details are governed by our complete Shipping Policy. In the event of any conflict, the full policy governs.

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