KYB 5550010 Suspension Shock Absorber - Rear

KYB Gas-a-Just Rear Shock for Mustang

The KYB Gas-a-just 5550010 is a monotube rear shock absorber built to restore OE-style control on select Ford Mustang applications. It uses separate hydraulic and high-pressure gas chambers to deliver responsive damping for everyday driving with added firmness when road conditions or driving demands increase.

Compatible with rear suspension service on 2015-2023 Ford Mustang models, this KYB shock absorber is a direct-fit replacement for vehicles that do not use electronic controlled suspension. The Gas-a-just line is focused on restoring original handling feel while maintaining consistent performance.

Key Features

• Monotube shock absorber design for consistent damping response
• Air-free hydraulic piston and valve area for control and responsiveness
• High-pressure nitrogen gas chamber with floating piston for ride comfort and quick performance response
• Rear suspension application for Ford Mustang
• Part number 5550010 for easy identification
• Compressed length: 12 in; extended length: 17.95 in; stroke length: 5.95 in
• Lower mount type: E3(75x100x0); upper mount type: S1(10MM)

Product Details

KYB Gas-a-just shocks are engineered as OE monotube replacements to help restore the vehicle’s original suspension behavior. On the Ford Mustang, the monotube layout separates the hydraulic working area from the gas charge, which supports stable damping and predictable rear suspension response. The 5550010 is a rear shock absorber for 2015-2018 Ford Mustang models with 19 inch and 20 inch wheels, except electronic suspension, and for 2019-2023 Ford Mustang models except electronic controlled suspension.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application. The KYB Gas-a-just line is positioned as an OE-style replacement solution for drivers who want the suspension to behave like the original equipment setup on Mustang rear applications.

What It Helps Address

• Excessive rear-end bounce over bumps
• Reduced damping control during acceleration, braking, or cornering
• Uneven or inconsistent ride response from a worn shock absorber
• Rear suspension noise or harshness caused by degraded shock performance
• Loss of original handling feel on Ford Mustang rear suspension service

Installation Notes

Fits 2015-2018 Ford Mustang, rear, with 19 inch and 20 inch wheels, except electronic suspension. Fits 2019-2023 Ford Mustang, rear, except electronic controlled suspension. Verify mount style, compressed length, extended length, and stroke length before installation. Inspect related suspension components and replace worn hardware or bushings as needed during service.

Quality Assurance

KYB is a long-established suspension manufacturer known for OE replacement shock absorber design. The Gas-a-just 5550010 is built to match the application requirements of select Ford Mustang rear suspension setups and to support consistent damping performance in daily driving conditions.