KYB 5540027 Suspension Shock Absorber - Rear

KYB Gas-a-just Rear Shock for Super Duty

The KYB Gas-a-just 5540027 is a rear suspension shock absorber for select Ford Super Duty trucks. It combines a monotube design with separate hydraulic and high-pressure gas chambers to deliver responsive damping for everyday driving and added control when road conditions change.

Compatible with 2017-2024 Ford F-250 Super Duty rear applications and 2017-2022 Ford F-350 Super Duty rear applications, this KYB shock is built for drivers who want consistent rear suspension control without sacrificing ride comfort. The 5540027 is also a direct cross-reference for OE-style replacement needs in the same application.

Gas-a-just Product Line Details

KYB Gas-a-just shocks use a monotube layout rather than a traditional twin-tube construction. That design separates the working hydraulic area from the nitrogen gas chamber, helping the shock respond quickly and resist performance loss from aeration during repeated suspension movement. The result is controlled damping for loaded driving, towing, and daily use on Ford F-250 Super Duty and Ford F-350 Super Duty rear suspensions.

Key Features

• Part number: 5540027
• Rear suspension shock absorber
• Monotube Gas-a-just design
• Compressed length: 16.26 in.
• Extended length: 26.3 in.
• Stroke length: 10.04 in.
• Lower mount type: E2 (14.2x38)
• Upper mount type: E1
• Dust cover included
• Fits 2023-2024 Ford F-250 Super Duty, rear, Monotube Performance Upgrade; Gas-a-just
• Fits 2017-2022 Ford F-250 Super Duty, rear, w/o Off Road Suspension; Gas-a-just
• Fits 2017-2022 Ford F-350 Super Duty, rear, w/ Single Rear Wheels, w/o Off Road Suspension; Gas-a-just

What This Shock Helps Address

• Rear-end bounce after bumps or expansion joints
• Excessive body movement under load
• Reduced damping consistency from worn shocks
• Harsh or unsettled rear suspension response
• Loss of control during towing or hauling on compatible Super Duty trucks

Installation Notes and Tips

Verify rear fitment by year, model, and suspension configuration before ordering. This part fits 2023-2024 Ford F-250 Super Duty rear applications, 2017-2022 Ford F-250 Super Duty rear applications without Off Road Suspension, and 2017-2022 Ford F-350 Super Duty rear applications with Single Rear Wheels and without Off Road Suspension. Confirm compressed length, extended length, and mount style against the original shock before installation. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Quality Assurance

KYB is a recognized suspension manufacturer with OE-level engineering focus. The Gas-a-just 5540027 is built to match the specified rear Super Duty applications and uses a monotube construction intended to maintain damping consistency through normal driving and repeated suspension movement.