KYB 554406 Suspension Shock Absorber - Rear

KYB Gas-a-just Rear Shock for Acura RDX

The KYB Gas-a-just 554406 is a monotube rear shock absorber built as an OE-style replacement for the Acura RDX. It is designed to restore original ride control, steering response, and suspension stability for daily driving, towing, and vehicles with larger wheels and tires.

Key Features

• Monotube OEM replacement design for direct suspension service
• Fits 2013-2018 Acura RDX, rear
• High-pressure gas and oil separation for consistent damping response
• Triple chrome plated piston rod helps reduce seal wear
• Internal rebound spring, dust cover, B-stop, and R-stop included in the design
• Built for vehicles that work, tow, or carry heavier wheel and tire setups
• Part number 554406 for easy identification and ordering

Product Details

KYB Gas-a-just shocks use a two-chamber monotube layout with an air-free hydraulic working area and a high-pressure nitrogen gas chamber separated by a floating piston. That design supports quick response and stable control while maintaining a comfortable ride in normal driving. For the Acura RDX, this rear shock is intended to restore the handling balance the vehicle was engineered to deliver. Part number 554406 is also a practical choice when replacing a worn rear shock on a 2013-2018 Acura RDX.

This part cross-references Monroe Shocks & Struts 172286 for the same application.

Common Problems This Part Can Address

• Excessive rear bounce or oscillation over bumps
• Reduced steering response and less stable handling
• Fluid leakage from a worn shock absorber
• Uneven ride quality after suspension wear
• Loss of control feel when towing or carrying heavier wheels and tires

Installation Notes

Fits 2013-2018 Acura RDX, rear. Replace the suspension strut and coil spring assembly according to the manufacturer’s instructions. Verify mount style and compressed/extended length before installation. This shock uses an upper S1 mount and lower E2(12X49.5) mount, with a compressed length of 14.8 inches, extended length of 19.96 inches, and stroke length of 5.16 inches.

Quality Assurance

KYB is an OE supplier known for suspension components engineered to match original vehicle behavior. The Gas-a-just line is designed as a monotube replacement to help maintain the Acura RDX’s intended control, ride consistency, and electronic safety system performance when the suspension is operating as designed. Part number 554406 is built to the same application-focused standards expected from KYB replacement shocks.