KYB 555054 Shock Absorber - Rear

KYB Gas-a-just Rear Shock Absorber

The KYB Gas-a-just 555054 is a monotube rear shock absorber built as an OE-style replacement for full-size GM SUVs and trucks. It is designed for vehicles that tow, carry heavier loads, or run larger wheels and tires, while helping restore original ride control and steering response.

Gas-a-just Product Line

KYB Gas-a-just shocks use a monotube design with separate hydraulic and high-pressure nitrogen gas chambers. That layout supports responsive damping during normal driving and quicker reaction when the suspension is working harder, making this line a practical choice for rear suspension service on GM applications.

Key Features

• Monotube OE replacement for rear suspension service
• Helps restore designed control and handling on full-size GM trucks and SUVs
• High-pressure gas and oil separation for fade-resistant operation
• Triple chrome plated piston rod helps reduce seal wear
• Improves steering response through higher gas pressure
• Dust cover included
• Compressed length: 15.55 in; extended length: 24.01 in; stroke length: 8.46 in
• Upper mount type: E2(14.6X42); lower mount type: E2(14.6X42)

Detailed Description

KYB 555054 is engineered for rear suspension replacement on select Cadillac Escalade, Chevrolet Tahoe, Chevrolet Suburban 1500, GMC Yukon, GMC Yukon XL 1500, Cadillac Escalade ESV, Cadillac Escalade EXT, and Chevrolet Avalanche applications. It is a direct-fit shock absorber for vehicles that need consistent rear damping after wear, load changes, or suspension fatigue. This part cross-references Monroe Shocks & Struts (e.g., 911506) for the same application.

As a Gas-a-just monotube shock, this unit separates the gas and oil chambers to maintain stable damping performance. The design supports vehicles used for towing, hauling, and daily driving, and it is especially relevant for GM rear suspension setups where original ride control has softened over time. The KYB 555054 is also listed as an OE replacement for several GM part numbers.

What It Helps Address

• Excessive rear bounce after bumps or dips
• Reduced control when towing or carrying heavier loads
• Soft or unstable rear ride feel on GM SUVs and trucks
• Delayed steering response caused by worn suspension damping
• Seal wear and fluid leakage associated with aging shocks

Installation Notes and Fitment

Compatible With rear suspension applications only. Fits 2008-2014 Cadillac Escalade, rear; Fits 2008-2014 Cadillac Escalade ESV, rear; Fits 2007-2014 Chevrolet Suburban 1500, rear; Fits 2011-2014 Chevrolet Tahoe, rear; Fits 2007-2014 Chevrolet Tahoe, rear; Fits 2007-2014 GMC Yukon, rear; Fits 2011-2014 GMC Yukon, rear; Fits 2007-2014 GMC Yukon XL 1500, rear; Fits 2008-2013 Cadillac Escalade EXT, rear; Fits 2007-2013 Chevrolet Avalanche, rear. Notes vary by vehicle and exclude certain electronic, premium smooth ride, ZW7, adjustable, and police package configurations where listed.

Verify mount style, compressed and extended length, and suspension option before installation. This shock uses E2 upper and lower mounts and includes a dust cover. Professional installation is recommended for vehicles with suspension option codes or electronic systems.

Quality Assurance

KYB is a recognized OE supplier, and the Gas-a-just line is built to match the original monotube shock concept used on many GM rear suspension applications. Part number 555054 is engineered for consistent fitment and damping performance across the listed vehicles.