KYB 554366 Shock Absorber - Rear

KYB Gas-a-just Rear Shock for Ford Super Duty

The KYB Gas-a-just 554366 is a rear monotube shock absorber built for Ford Super Duty trucks that need firmer control under load. It is engineered for 2005-2016 Ford F-250 Super Duty and 2005-2016 Ford F-350 Super Duty rear applications, including 2008-2016 Ford F-350 Super Duty dual rear wheel setups.

Gas-a-just Product Line

KYB Gas-a-just shocks use a monotube design with separate gas and oil chambers for quick response and consistent damping. This layout is suited to trucks that tow, work, or run larger tires and wheels, where added control and reduced fade matter during repeated suspension movement.

Key Features

• Adds up to 25% more damping performance over original equipment shocks
• High-pressure monotube construction separates gas and oil for fade-resistant operation
• Designed specifically for Ford truck suspension tuning
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Higher gas pressure improves steering response and suspension control
• Supports electronic safety systems by helping the suspension operate as the vehicle manufacturer intended
• Dust cover included

Detailed Description

KYB 554366 is a rear suspension shock absorber with a compressed length of 16.33 inches, an extended length of 26.53 inches, and a 10.20-inch stroke. It uses an E2(12X38) lower mount and an E1 upper mount for the listed Ford Super Duty rear fitments. This part cross-references Monroe Shocks & Struts 911265 for the same application. For buyers searching for a rear shock absorber for 2005-2016 Ford F-250 Super Duty or 2008-2016 Ford F-350 Super Duty, KYB 554366 provides a direct-fit performance upgrade focused on control, response, and durability.

What It Helps Address

• Excessive rear-end bounce over rough roads
• Reduced control when towing or hauling
• Shock fade during repeated suspension movement
• Steering response that feels slow or loose
• Premature seal wear from piston rod surface damage

Installation Notes and Tips

Verify rear fitment by year, model, and configuration before installation. This shock is listed for the rear position only and should be matched to the vehicle’s original mount style and dimensions. Inspect related suspension components, mounting points, and bushings during replacement to ensure proper operation after installation.

Quality Assurance

KYB designs Gas-a-just shocks for consistent damping performance and long-term control in demanding truck use. The monotube design, high-pressure gas charge, and chrome-plated piston rod are used to support stable operation and reduce wear in service.

Compatible With

• Fits 2008-2016 Ford F-350 Super Duty, rear, w/ Dual Rear Wheels; Gas-a-just
• Fits 2005-2016 Ford F-350 Super Duty, rear; Gas-a-just
• Fits 2005-2007 Ford F-250 Super Duty, rear; Gas-a-just