KYB 554385 Suspension Shock Absorber - Rear

KYB Gas-a-just Rear Shock Absorber

KYB Gas-a-just 554385 is a monotube rear shock absorber built as an OE-style replacement for vehicles that need restored control, quicker response, and consistent damping. It is engineered for the rear suspension on select Hyundai Accent and Kia Forte applications, including the 2012-2017 Hyundai Accent rear and 2010-2013 Kia Forte rear.

Gas-a-just Product Line

The Gas-a-just line uses a monotube design with separate hydraulic and high-pressure nitrogen gas chambers. That layout supports responsive damping during normal driving while adding firmer control when the suspension is working harder, such as with towing, heavier wheels and tires, or frequent load changes.

Key Features

• Monotube OE replacement design for direct suspension service
• Restores designed handling and control on Hyundai Accent and Kia Forte rear applications
• High-pressure gas and oil separation for consistent fade-resistant operation
• Quick steering response from higher gas pressure and immediate damping action
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Built for vehicles that work, tow, or run larger, heavier tires and wheels
• Dust cover included
• Lower mount type: E2(12X36); upper mount type: E2(12X47)

Detailed Description

KYB 554385 is a rear suspension shock absorber designed to replace the original monotube unit and restore factory-style ride control. Its air-free hydraulic piston and valve area improve responsiveness, while the separate high-pressure nitrogen gas chamber with floating piston helps maintain stable performance during repeated suspension movement. With a compressed length of 10.07 inches, extended length of 14.4 inches, and 3.70 inches of stroke, this shock is built around the specified rear fitment for the Hyundai Accent and Kia Forte platform. This part cross-references Monroe Shocks & Struts 5672 for the same application.

What This Shock Absorber Helps Address

• Excessive rear bounce after bumps or dips
• Reduced steering response caused by worn rear damping
• Fluid leakage from a worn shock rod seal
• Fade or inconsistent control during repeated suspension movement
• Loss of ride stability on vehicles with heavier wheels and tires

Installation Notes and Tips

• Fits 2012-2017 Hyundai Accent, rear.
• Fits 2010-2013 Kia Forte, rear.
• Fits 2010-2013 Kia Forte Koup, rear.
• Replace the suspension strut and coil spring assembly according to the manufacturer’s instructions where specified.
• Verify mount style and dimensions before installation: E2(12X36) lower mount, E2(12X47) upper mount.
• Inspect related rear suspension components for wear before completing the repair.

Quality Assurance

KYB designs the Gas-a-just line as an OE monotube replacement to match original suspension function and support electronic safety systems that depend on proper suspension, brake, and tire performance. Part number 554385 is built to restore controlled damping for the listed Hyundai and Kia rear applications.