KYB 553380 Shock Absorber - Rear

KYB Gas-a-Just Rear Shock for Mercedes-Benz E-Class

The KYB Gas-a-Just 553380 is an OE-style monotube shock absorber built to restore rear suspension control on select Mercedes-Benz E-Class applications. It uses separate hydraulic and high-pressure gas chambers to deliver responsive damping, stable handling, and consistent ride quality during everyday driving.

Key Features

• Monotube OE replacement for rear suspension service
• Fits 2006-2009 Mercedes-Benz E350, rear, excluding air suspension
• Fits 2004-2005 Mercedes-Benz E320, rear, excluding air suspension
• High-pressure monotube design separates gas and oil for quick response and fade resistance
• Triple chrome-plated piston rod helps reduce seal wear and fluid leakage
• Built for vehicles that tow, carry load, or use larger wheels and tires
• Dust cover included
• B-stop and R-stop included in the design

Product Details

KYB Gas-a-Just shocks are designed as direct OE monotube replacements for vehicles that need firmer control than a conventional twin-tube design can provide. Part number 553380 uses an air-free hydraulic working area for damping response and a separate nitrogen gas chamber with a floating piston to maintain consistent performance. On Mercedes-Benz E350 and E320 rear applications, this setup helps restore the handling balance the vehicle was engineered to deliver. This part cross-references Monroe Shocks & Struts 39109 for the same application.

Common Problems This Shock Can Address

• Rear-end bounce or reduced damping control
• Excessive body movement over bumps and dips
• Delayed steering response caused by worn rear shocks
• Fluid leakage from a failing shock absorber
• Loss of stability on vehicles with heavier wheels, tires, or load demands

Installation Notes and Tips

Verify rear fitment by model year and suspension type before installation. This shock fits 2006-2009 Mercedes-Benz E350, rear, and 2004-2005 Mercedes-Benz E320, rear, with the noted air suspension exclusions. Confirm compressed length, extended length, stroke, and mount style against the original part before service. Replace worn shocks in matched axle pairs when the opposite side shows similar wear.

Quality Assurance

KYB is an OE supplier known for suspension components engineered to match factory control characteristics. The Gas-a-Just line focuses on monotube construction, fast response, and consistent damping for demanding street use.