KYB 5540014 Shock Absorber - Rear

KYB Gas-a-Just Rear Shock for Lexus GS350

The KYB Gas-a-Just 5540014 is a rear suspension shock absorber built as an OE-style monotube replacement for the 2013-2020 Lexus GS350. It restores original handling characteristics with quick response, stable control, and consistent damping for daily driving and heavier-duty use.

Key Features

• Monotube OE replacement design for direct suspension service
• Separate hydraulic and high-pressure nitrogen chambers for responsive control
• High-pressure construction helps maintain fade-resistant operation
• Triple chrome plated piston rod helps reduce seal wear
• Internal rebound spring included for controlled suspension movement
• Built for vehicles that tow, work, or run larger tires and wheels
• Supports proper operation of electronic safety systems when suspension performance is restored

Product Details

KYB Gas-a-Just shocks are part of the Gas-a-Just product line, which uses a monotube layout to separate gas and oil for consistent damping response. On the Lexus GS350 rear suspension, part number 5540014 helps restore the vehicle’s designed control and handling while delivering the firmer response expected from a high-pressure monotube shock. This rear shock absorber is a direct replacement for 2013-2020 Lexus GS350 models with the exception of Adaptive Control Suspension applications.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Problems It Can Help Address

• Excessive rear bounce or oscillation over bumps
• Reduced steering response and less stable handling
• Shock fade during repeated suspension movement
• Oil leakage from a worn rear shock absorber
• Uneven ride control on heavier wheels or towing use

Installation Notes and Tips

Compatible With 2013-2020 Lexus GS350, rear. Verify that the vehicle does not use Adaptive Control Suspension before ordering. Confirm upper and lower mount types, compressed length, extended length, and stroke length against the original shock before installation. Inspect related suspension components, including mounts and bushings, so the new shock can operate as intended.

Quality Assurance

KYB is an OE supplier known for suspension components engineered to match original vehicle behavior. The Gas-a-Just design uses a high-pressure monotube layout and a chrome piston rod to support consistent performance and reduced seal wear in normal driving and demanding conditions.