KYB 553366 Shock Absorber - Rear

KYB Gas-a-Just Rear Shock for Mercedes-Benz CLK

The KYB Gas-a-Just 553366 is a monotube rear shock absorber built as an OE-style replacement for select Mercedes-Benz CLK models. It is engineered to restore original ride control, steering response, and suspension stability for daily driving, towing, and vehicles with larger wheels and tires.

Compatible with 2003-2009 Mercedes-Benz CLK rear applications, this KYB shock uses a high-pressure monotube design that separates gas and oil for consistent damping and quick response. The 553366 is a direct-fit suspension shock absorber for drivers who want factory-correct control without changing the vehicle’s intended suspension behavior.

Key Features

• Monotube OE replacement for rear suspension applications
• High-pressure gas design for responsive damping and fade-resistant operation
• Separate gas and oil chambers for consistent control
• Triple chrome plated piston rod helps reduce seal wear
• Built with dust cover, B-stop, and R-stop features
• Designed for Mercedes-Benz CLK models with standard rear suspension configurations
• Part number 553366 for easy identification and ordering

Product Details

KYB Gas-a-Just shocks are designed around a two-chamber monotube layout: an air-free hydraulic working area for control and a high-pressure nitrogen gas section with a floating piston for immediate damping response. That construction helps the shock react quickly to road inputs while maintaining a comfortable ride during normal use. For Mercedes-Benz CLK350, CLK550, CLK500, CLK320, and CLK55 AMG rear applications, the 553366 supports the vehicle’s original suspension tuning and helps preserve the performance expected by factory electronic safety systems.

This part cross-references Monroe Shocks & Struts 39047 for the same application.

What It Helps Address

• Excessive rear bounce or poor body control
• Delayed steering response from worn suspension damping
• Ride fade during heavier use, towing, or load changes
• Oil leakage from a failing shock absorber
• Uneven handling feel caused by tired rear shocks

Installation Notes and Tips

• Fits 2006-2009 Mercedes-Benz CLK350, rear, without sport suspension.
• Fits 2007-2009 Mercedes-Benz CLK550, rear; replace the suspension strut and coil spring assembly according to manufacturer instructions.
• Fits 2003-2006 Mercedes-Benz CLK500, rear; replace the suspension strut and coil spring assembly according to manufacturer instructions.
• Fits 2003-2005 Mercedes-Benz CLK320, rear, excluding sport suspension.
• Fits 2004-2005 Mercedes-Benz CLK320, rear; replace the suspension strut and coil spring assembly according to manufacturer instructions.
• Fits 2003-2005 Mercedes-Benz CLK55 AMG, rear; replace the suspension strut and coil spring assembly according to manufacturer instructions.
• Verify compressed length, extended length, and mount style before installation: 18.11 in compressed, 22.44 in extended, 4.33 in stroke.

Quality Assurance

KYB is known for OE-level suspension engineering, and the Gas-a-Just line is built as a monotube replacement to match the vehicle’s original control characteristics. The 553366 uses a triple chrome plated piston rod and a high-pressure gas design to support consistent operation and reduced seal wear over time.