KYB 554373 Shock Absorber - Rear

KYB Gas-a-just Rear Shock for Ford F-150

The KYB Gas-a-just 554373 is a rear suspension shock absorber built for Ford F-150 trucks that need firmer control than a standard twin-tube design. It uses a monotube layout with separate gas and oil chambers to deliver quick response, consistent damping, and reduced fade during repeated suspension movement.

Gas-a-just Product Line

KYB Gas-a-just shocks are tuned for trucks that work harder than a daily commuter, including Ford F-150 models used for towing, hauling, or running larger tires and wheels. The 554373 part number is part of that line and is engineered to add damping performance while maintaining a controlled ride in normal driving.

Key Features

• Adds up to 25% more damping performance over original equipment shocks
• Monotube design separates gas and oil for fade-free operation and fast response
• High-pressure nitrogen gas helps maintain consistent control under load
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Designed specifically for Ford F-150 rear applications
• Supports steering response and suspension control when the truck is carrying work demands

Detailed Description

KYB 554373 is a rear shock absorber for 2009-2025 Ford F-150 applications listed below. The monotube construction uses an air-free hydraulic working area for responsiveness and a separate high-pressure gas chamber for stable ride control. This design helps the shock react quickly to road inputs and maintain damping consistency when the suspension is working harder. The 554373 also includes a dust cover and uses E2(12X38) upper and lower mounts. Compressed length is 17.71 inches, extended length is 28.66 inches, and stroke length is 10.95 inches.

This part cross-references Monroe Shocks & Struts 911302 for the same application.

What It Helps Address

• Excessive rear bounce after bumps or load changes
• Reduced control on Ford F-150 trucks with towing or hauling use
• Shock fade from repeated suspension cycling
• Slow steering response caused by worn rear damping
• Ride instability on trucks with larger, heavier tires and wheels

Installation Notes and Fitment

Compatible with rear suspension applications on Ford F-150 models listed below. Verify electronic suspension, payload package, and package notes before installation.

• Fits 2021-2025 Ford F-150, Rear, w/o Electronic Suspension, w/o Heavy Duty Payload Package; Gas-a-just
• Fits 2009-2020 Ford F-150, Rear, Install a monotube shock absorber to enhance performance.; Gas-a-just
• Fits 2010-2012 Ford F-150, Rear, Monotube Performance Upgrade; w/ Standard Package or w/ Off Road Package; Gas-a-just

Quality Assurance

KYB designs Gas-a-just shocks with a high-pressure monotube layout to separate gas and oil, helping maintain consistent damping performance and reduce fade. The triple chrome plated piston rod is used to support seal durability in demanding rear suspension service.