KYB 555050 Shock Absorber - Rear

KYB Gas-a-just Rear Shock for Hummer H3

The KYB Gas-a-just 555050 is an OE-style monotube shock absorber built to restore factory handling on the rear of the 2006-2010 Hummer H3. Its high-pressure design separates gas and oil for consistent damping, quick steering response, and controlled ride quality in everyday driving.

Key Features

• Monotube OEM replacement designed for the rear suspension
• High-pressure gas and oil separation for fade-resistant operation
• Air-free hydraulic piston and valve area for responsive control
• Triple chrome plated piston rod helps reduce seal wear
• Built for vehicles that tow, work, or run larger tires and wheels
• Supports proper operation of electronic safety systems by maintaining suspension control
• Dust cover included

Product Details

KYB Gas-a-just shocks are engineered as direct OE monotube replacements for vehicles that need firmer control than a standard twin-tube design can provide. Part number 555050 uses a monotube layout with a floating piston and high-pressure nitrogen gas chamber, which helps maintain consistent damping under load and during repeated suspension movement. For the Hummer H3, this rear shock is a practical choice when the vehicle is used for towing, heavier wheel and tire setups, or general driving where stable rear suspension response matters. This part cross-references Monroe Shocks & Struts (e.g., 911528) for the same application.

What It Helps Address

• Rear suspension bounce or reduced damping control
• Excessive body movement over bumps and uneven pavement
• Delayed steering response caused by worn shock absorbers
• Fluid leakage related to seal wear on aging shocks
• Loss of consistent ride control on a Hummer H3 with heavier loads or tires

Installation Notes and Tips

Fits 2006-2010 Hummer H3, rear. Replace the suspension strut and coil spring assembly according to the manufacturer’s instructions. Verify compressed length, extended length, and mount style before installation: compressed length 15.35 in., extended length 24.09 in., stroke length 8.74 in. Upper mount type is E3(61.6X87X20) and lower mount type is E2(14.2X43). Confirm the rear application and inspect related suspension components for wear before completing the job.

Quality Assurance

KYB positions the Gas-a-just line as an OE monotube replacement designed to restore original suspension control and handling characteristics. Part number 555050 is built with a triple chrome plated piston rod and a monotube gas-pressure design to support consistent performance in daily use.