Front Passenger Side Lower Control Arm and Ball Joint Set

Heavy-Duty Suspension Restoration for Mercedes-Benz GL, GLE, GLS, and ML Class

Restore the precision handling and ride comfort of your luxury SUV with this premium 2-Piece Front Lower Control Arm and Ball Joint Set. Engineered specifically for the Mercedes-Benz W166 and X166 chassis, this kit addresses the common failures of the front suspension system. Over time, the heavy curb weight of these SUVs causes the hydraulic control arm bushings to leak and the ball joints to develop play, resulting in steering wander, clunking noises over bumps, and rapid tire wear.

This set provides a comprehensive solution by including both the main lower control arm (with pre-installed bushings) and the heavy-duty lower ball joint. By replacing both components simultaneously on the passenger side, you ensure a complete restoration of the suspension geometry and eliminate the labor overlap of replacing them separately.

Fitment Verification and Vehicle Applications

This set is designed for the Front Passenger Side (Right) Lower position on the following Mercedes-Benz models:

• GL-Class (X166): 2013, 2014, 2015, 2016 (GL350, GL450, GL550, GL63 AMG).

• GLE-Class (W166): 2016, 2017, 2018, 2019 (GLE300d, GLE350, GLE400, GLE550e).

• GLS-Class (X166): 2017, 2018, 2019 (GLS350d, GLS450, GLS550, GLS63 AMG).

• ML-Class (W166): 2012, 2013, 2014, 2015 (ML250, ML350, ML400, ML550, ML63 AMG).

• Fitment Note: Validated for models with standard or Airmatic suspension. Please verify your specific sub-model and engine type to ensure exact compatibility.

Technical Specifications and Attributes

• Quantity: 2-Piece Set.

• Position: Front Right (Passenger Side) Lower.

• Material: High-Strength Forged Aluminum (Control Arm) and Alloy Steel (Ball Joint).

• Bushing Type: Pre-installed High-Durability Rubber/Hydraulic Bushings.

• Surface Finish: Corrosion-Resistant Coating.

• Fitment Type: Direct Replacement.

What’s in the Box

• (1) Front Passenger Side Lower Control Arm (with pre-installed bushings)

• (1) Front Passenger Side Lower Ball Joint

• (1) Installation Hardware Kit (where applicable)

Industry Cross-Reference Numbers

• Mercedes-Benz: 1663300207, 1663300235, A1663300207, 166 330 02 07

• MOOG: RK643149, K500336

• Dorman: 524-540

• Febi-Bilstein: 47930

• Beck/Arnley: 101-8101

• Delphi: TC8091

Installation and Technical Tips

• The "Laden Weight" Rule: When installing the control arm, do not perform the final torque on the inner bushing bolts while the vehicle is on a lift with the wheels hanging. The suspension must be at its normal ride height (on the ground or on drive-on ramps) before tightening. Failure to do this will twist the rubber bushings beyond their design limit, leading to premature tearing.

• Ball Joint Press: While the control arm is a bolt-on component, ensure the lower ball joint is seated perfectly in the steering knuckle. Check the mounting holes for any signs of ovaling or damage before securing the new joint.

• Alignment Required: Replacing a lower control arm significantly alters the vehicle's camber and toe settings. A professional four-wheel alignment is mandatory following installation to prevent uneven tire wear and ensure the Electronic Stability Program (ESP) functions correctly.

• Safety Fasteners: Mercedes-Benz frequently utilizes "one-time use" (torque-to-yield) bolts for suspension components. It is highly recommended to use new mounting hardware to ensure the fasteners maintain their tension under the high stresses of the SUV's front end.