KYB 7240001 Suspension Shock Absorber - Rear

KYB Gas-a-just Rear Shock for Lexus GS350

The KYB Gas-a-just 7240001 is a rear suspension shock absorber for 2013-2020 Lexus GS350 models with Adaptive Control Suspension. It is a direct OE replacement built for responsive damping, stable ride control, and consistent performance in normal driving and harder use.

Gas-a-just Product Line

KYB Gas-a-just shocks use a monotube design with separate working chambers. The hydraulic piston and valve area supports quick response and control, while the high-pressure nitrogen gas chamber with a floating piston helps maintain ride comfort and adds immediate damping response when conditions change. This layout also resists fade from aeration.

Key Features

• Direct OE replacement for Lexus vehicles equipped with adaptive dampers
• Monotube adaptive damper design for consistent rear suspension control
• Air-free hydraulic working area for responsiveness
• High-pressure nitrogen gas chamber helps reduce fade from aeration
• Rear fitment for 2013-2020 Lexus GS350 with Adaptive Control Suspension
• Lower mount type: E2 (14.2x70)
• Upper mount type: S1 (12MM)
• Compressed length: 18.69 in; extended length: 25.15 in; stroke length: 6.46 in

Detailed Description

KYB 7240001 is engineered for the rear position on 2013-2020 Lexus GS350 models with Adaptive Control Suspension. As a Gas-a-just shock absorber, it uses a monotube adaptive damper layout that supports precise control and quick response while maintaining a comfortable ride during everyday driving. The separate hydraulic and gas chambers help the shock react smoothly to changing road conditions and performance demands. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Excessive rear bounce or oscillation
• Reduced damping control from a worn adaptive shock
• Harsh or inconsistent rear ride quality
• Rear-end instability over bumps and uneven pavement
• Loss of response in an OE adaptive suspension setup

Installation Notes and Tips

Verify rear fitment by matching the vehicle’s Adaptive Control Suspension setup before installation. Confirm mount style and dimensions against the original shock: lower mount E2 (14.2x70), upper mount S1 (12MM), compressed length 18.69 in, extended length 25.15 in, and stroke length 6.46 in. This part is listed for the rear position only on 2013-2020 Lexus GS350 models.

Quality Assurance

KYB is a recognized OE supplier, and the Gas-a-just line is built to OE-style specifications for direct replacement use on supported Lexus applications. Part number 7240001 is intended to restore factory-type damping behavior in the rear suspension.