KYB Gas-a-Just Rear Monotube Shock Absorber for Ford Mustang 2005–2013 – Part Number 554355

The KYB Gas-a-just monotube shock absorber has additional performance advantages over the traditional twin-tube design: It can instantly, automatically adjust to your performance needs and never experiences fade due to aeration. The KYB Gas-a-just has two separate working chambers: An air-free hydraulic piston and valve area for responsiveness and control, and a second high-pressure nitrogen gas area with a floating piston that provides a comfortable ride during normal driving and adds instant performance on demand.

• Electronic safety systems depend on the suspension, brakes and tires operating as the vehicle manufacturer intended. The KYB Gas-a-just helps keep Electronic Safety Systems performing as designed.

The KYB Gas-a-Just rear monotube shock absorber is engineered to improve suspension control, responsiveness, and ride stability on compatible Ford Mustang applications. Unlike traditional twin-tube designs, the Gas-a-Just uses a monotube construction with separate hydraulic and high-pressure nitrogen chambers to respond quickly to changing driving conditions.

A floating piston separates the nitrogen gas from the hydraulic fluid, helping prevent aeration and maintaining consistent damping performance during demanding driving. The result is improved handling during acceleration, cornering, braking, and uneven-road conditions while preserving a comfortable ride during normal driving. KYB Gas-a-Just technology can automatically adapt to performance demands without requiring electronic adjustment.

Maintaining properly functioning suspension components also supports the operation of the vehicle’s electronic safety systems. KYB recommends replacing worn or damaged shock absorbers in matched axle pairs and verifying fitment before installation. This rear shock absorber is designed for select 2005–2013 Ford Mustang applications; confirm the vehicle configuration and application year before purchase.

Key Product Specifications & Technical Data

• Brand: KYB
• Part Number: 554355
• Product Type: Rear shock absorber
• Design: Gas-a-Just monotube
• Operating Medium: Hydraulic fluid and high-pressure nitrogen gas
• Installation Position: Rear
• Vehicle Type: Automotive passenger vehicle
• Electronic Safety Compatibility: Helps support manufacturer-intended suspension performance

What's Included

• One KYB Gas-a-Just rear monotube shock absorber

Fitment: Fits select 2005–2013 Ford Mustang applications, including listed 2006, 2007, 2011, 2012, and 2013 model-year vehicles. Verify exact fitment using the vehicle year, configuration, and manufacturer application data before ordering.

Features:

• Monotube Performance: Provides responsive damping and improved suspension control compared with conventional twin-tube designs.
• Automatic Load Response: Adjusts damping performance to help accommodate changing road and driving conditions.
• Fade Resistance: Separate hydraulic and nitrogen chambers help prevent aeration-related performance loss during demanding use.
• Safety System Support: Helps the suspension perform as intended to support the operation of the vehicle’s electronic safety systems.

Fitments:
2005 Ford Mustang Base
2005 Ford Mustang GT
2006 Ford Mustang Base
2006 Ford Mustang GT
2007 Ford Mustang Base
2007 Ford Mustang GT
2008 Ford Mustang Base
2008 Ford Mustang GT
2009 Ford Mustang Base
2009 Ford Mustang GT
2010 Ford Mustang Base
2010 Ford Mustang GT
2011 Ford Mustang Base
2011 Ford Mustang GT
2012 Ford Mustang Base
2012 Ford Mustang GT
2013 Ford Mustang Base
2013 Ford Mustang GT
2014 Ford Mustang Base
2014 Ford Mustang GT

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Unknown
Part Type: automotive
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: t
Units Per Sku: 1