KYB Gas-a-Just Rear Monotube Shock Absorber 5550021 for 2021-2022 Ford F-150

The Gas-a-just monotube shock absorber is available as an OE monotube replacement to restore your vehicles original capabilities. 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 part number 5550021 is a high-pressure monotube rear shock absorber designed as an OE-style replacement for select 2021-2022 Ford F-150 models equipped with off-road suspension. It helps restore the truck’s original ride control, handling response, and suspension performance without requiring changes to the factory suspension system.

Gas-a-Just technology uses two separate working chambers. An air-free hydraulic piston and valve area delivers responsive damping and precise control, while a high-pressure nitrogen gas chamber with a floating piston helps reduce aeration and supports consistent performance. This design provides a comfortable ride during normal driving and additional control when road conditions, payload demands, or vehicle movement require increased damping.

Maintaining properly functioning shocks is also important for vehicle safety systems. The KYB Gas-a-Just shock absorber helps support the suspension, braking, and tire performance required for electronic safety systems to operate as intended. This rear shock is intended for select Ford F-150 King Ranch, Lariat, XL, XLT, and Limited configurations with off-road suspension. Verify the vehicle’s exact application before installation.

What's Included

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

Fitment

Fits select 2021-2022 Ford F-150 King Ranch, Lariat, XL, XLT, and Limited models with off-road suspension. Always confirm application details using the vehicle’s year, trim, drivetrain, and suspension configuration.

Features:

• Monotube Design: Provides responsive damping and consistent control through separate hydraulic and high-pressure nitrogen chambers.
• OE Replacement Application: Designed to help restore the original suspension performance of select Ford F-150 models.
• High-Pressure Nitrogen Gas: Helps reduce aeration and supports reliable shock performance during changing driving conditions.
• Electronic Safety Support: Helps maintain suspension control needed for electronic safety systems, braking, and tire performance to function as designed.

Fitments:
2021 Ford F-150 King Ranch
2021 Ford F-150 Lariat
2021 Ford F-150 Limited
2021 Ford F-150 Platinum
2021 Ford F-150 XL
2021 Ford F-150 XLT
2022 Ford F-150 King Ranch
2022 Ford F-150 Lariat
2022 Ford F-150 Limited
2022 Ford F-150 Platinum
2022 Ford F-150 XL
2022 Ford F-150 XLT
2023 Ford F-150 King Ranch
2023 Ford F-150 Lariat
2023 Ford F-150 Limited
2023 Ford F-150 Platinum
2023 Ford F-150 XL
2023 Ford F-150 XLT
2024 Ford F-150 King Ranch
2024 Ford F-150 Lariat
2024 Ford F-150 Platinum
2024 Ford F-150 XL
2024 Ford F-150 XLT
2025 Ford F-150 King Ranch
2025 Ford F-150 Lariat
2025 Ford F-150 Platinum
2025 Ford F-150 XL
2025 Ford F-150 XLT

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