KYB 5510039 Suspension Strut - Front

KYB Gas-a-Just Front Strut for Ford F-150

The KYB Gas-a-just 5510039 is a front suspension strut built for 2014-2020 Ford F-150 applications listed below. It uses a monotube design with separate hydraulic and high-pressure nitrogen gas chambers to deliver responsive damping and consistent ride control during everyday driving and harder suspension demands.

Gas-a-Just Product Line Details

KYB Gas-a-just struts are part of KYB’s performance-oriented monotube line. Compared with a traditional twin-tube layout, this design separates the working chambers so the hydraulic section stays air-free for control, while the nitrogen gas section supports ride comfort and quick adjustment when road conditions change.

Key Features

• Part number: 5510039
• Front suspension strut for Ford F-150
• Monotube construction for direct response and stable damping
• Air-free hydraulic piston and valve area for steering and body control
• High-pressure nitrogen gas chamber with floating piston for ride support
• Compressed length: 17.2 in.
• Extended length: 21.81 in.
• Stroke length: 4.61 in.
• Lower mount type: E3 (88.75x117x13)
• Upper mount type: S1 (12MM)

Detailed Description

KYB 5510039 is engineered for drivers who want a front strut that responds quickly to suspension movement without the fade associated with aeration in conventional twin-tube designs. The monotube layout helps maintain consistent damping performance, while the gas-charged chamber supports control over rough pavement, braking, and load transfer. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application. Compatible vehicle coverage includes 2014 Ford F-150, front, w/o Heavy Duty Suspension; Gas-a-just, and 2015-2020 Ford F-150, front, w/o Heavy Duty Payload Package; Gas-a-just.

What This Strut Helps Address

• Excessive front-end bounce after bumps
• Reduced steering stability on uneven roads
• Suspension fade during repeated compression cycles
• Nose dive under braking
• Loose or unsettled ride feel in the front suspension

Installation Notes and Tips

Verify the lower and upper mount dimensions before installation: lower mount type E3 (88.75x117x13) and upper mount type S1 (12MM). Confirm the vehicle is one of the listed Ford F-150 front applications and check whether the truck is equipped with Heavy Duty Suspension or the Heavy Duty Payload Package, since those notes affect fitment. Replace struts in axle pairs when wear is similar side to side, and inspect related suspension components such as mounts, bushings, and tires during service.

Quality Assurance

KYB is a recognized suspension manufacturer with OE-level engineering focus, and the Gas-a-just line is built around a monotube design for consistent damping performance. Part number 5510039 is specified for the listed Ford F-150 front applications.