KYB 554363 Shock Absorber - Rear

KYB Gas-a-just Rear Shock for F-350 Super Duty

The KYB Gas-a-just 554363 is a rear suspension shock absorber built for 2005-2007 Ford F-350 Super Duty trucks. It uses a monotube design with separate gas and oil chambers to deliver quick response, consistent damping, and reduced fade during demanding driving.

Key Features

• Fits 2005-2007 Ford F-350 Super Duty, rear
• Monotube construction separates gas and oil for fade-free operation
• Up to 25% more damping performance than original equipment shocks
• High-pressure nitrogen gas helps the shock respond quickly to steering and road inputs
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Designed for trucks that work, tow, and run larger, heavier tires and wheels
• Dust cover included

Product Details

KYB Gas-a-just shocks are engineered for vehicles that see heavier use than standard commuting. The 554363 uses an air-free hydraulic working area for control and a separate high-pressure gas chamber for added support when load, road conditions, or driving demands increase. For 2005-2007 Ford F-350 Super Duty rear suspension service, this design helps maintain stable damping response and consistent ride control. This part number, 554363, is also a direct reference point for shoppers comparing OE-style replacement options for the same application.

This part cross-references Monroe Shocks & Struts 911039 for the same application.

Common Problems This Shock Can Address

• Excessive rear-end bounce over rough pavement
• Reduced control when towing or carrying heavier loads
• Shock fade during repeated suspension movement
• Delayed response from worn rear shocks
• Fluid leakage caused by seal wear on aging units

Installation Notes and Tips

Compatible With 2005-2007 Ford F-350 Super Duty rear suspension service. Replace the suspension strut and coil spring assembly according to the manufacturer’s instructions where applicable. Verify compressed length, extended length, and mount types before installation: compressed length 15.74, extended length 25.47, stroke length 9.73, lower mount type E2(12X38), upper mount type E1. The part number 554363 should be matched to the vehicle’s rear application before final assembly.

Quality Assurance

KYB’s Gas-a-just line uses a high-pressure monotube design to separate gas and oil, which supports consistent damping response and reduced fade under demanding use. The triple chrome plated piston rod is used to help reduce seal wear and support long-term shock performance.