KYB 5540013 Shock Absorber - Rear

KYB Gas-a-Just Rear Shock Absorber

KYB Gas-a-Just 5540013 is a monotube rear shock absorber built as an OE-style replacement for select Lexus applications. It restores controlled damping for vehicles that need consistent response, including the Lexus GS350 rear shock application and related GS300, GS200t, RC350, and RC200t rear fitments.

Key Features

• Monotube OE replacement design for direct suspension service
• Separate hydraulic and high-pressure nitrogen chambers for responsive damping
• High-pressure construction separates gas and oil for fade-resistant operation
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Internal rebound spring included for controlled extension
• Built for vehicles that tow, work, or run larger and heavier tires and wheels
• Supports steering response and electronic safety system performance by maintaining suspension control
• Dimensions: 18.69 in compressed length, 23.44 in extended length, 4.75 in stroke

Product Details

The KYB Gas-a-Just line focuses on monotube shock absorber construction for drivers who want OE replacement performance with firmer control under load. Part number 5540013 uses an air-free hydraulic piston area for immediate response and a separate nitrogen gas chamber with a floating piston to maintain consistent ride quality during normal driving. This design helps the rear suspension stay composed when the vehicle is carrying extra weight or operating with larger wheels and tires. For Lexus GS350 rear shock replacement, as well as GS300, GS200t, RC350, and RC200t rear applications, 5540013 is a practical service part for restoring original handling characteristics.

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 steering response from worn rear damping
• Fluid leakage related to shock seal wear
• Fade during repeated suspension movement or heavier use
• Loss of ride control after shock absorber wear

Installation Notes

Fits 2013-2020 Lexus GS350, rear; 2018-2019 Lexus GS300, rear; 2015-2018 Lexus RC350, rear; 2017 Lexus GS200t, rear; 2017 Lexus RC200t, rear; 2016 Lexus GS200t, rear; and 2016 Lexus RC200t, rear. Follow the manufacturer’s instructions for suspension strut and coil spring assembly service where noted. Verify upper mount type S1 (12 mm) and lower mount type E2 (14.2 x 70) before installation.

Quality Assurance

KYB is an OE-focused suspension brand, and the Gas-a-Just design is engineered as a monotube replacement to restore factory-style control and handling on the listed Lexus rear applications. Part number 5540013 is built to support consistent damping performance in everyday driving and load-bearing use.