KYB KG54339 Shock Absorber - Front

KYB Gas-a-Just Front Shock Absorber

The KYB Gas-a-Just KG54339 is a monotube front shock absorber built for GM trucks that need firmer control than a standard OE-style replacement. It is designed for Chevrolet Silverado 1500, Silverado 1500 Classic, Silverado 2500, Silverado 1500 HD, Suburban 2500, GMC Sierra 1500, Sierra 1500 Classic, Sierra 2500, Sierra 1500 HD, and Yukon XL 2500 front suspension applications.

The Gas-a-Just line uses a high-pressure monotube design with separate gas and oil chambers for quick response and consistent damping. This part number, KG54339, is aimed at vehicles that work, tow, or run larger tires and wheels, while still maintaining controlled ride quality in daily driving.

Key Features

• Up to 25% more damping performance than original equipment shocks
• Monotube construction separates gas and oil for fade-resistant operation
• Higher gas pressure improves steering response and front-end control
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Valving and components are tuned specifically for GM truck applications
• Dust cover included
• Front shock absorber for OE replacement or performance upgrade use

Product Details

KYB Gas-a-Just shocks are engineered as OE monotube replacements for trucks that need more immediate damping response than a conventional twin-tube design. The KG54339 uses an air-free hydraulic working area for control and a separate high-pressure nitrogen chamber with a floating piston to help maintain consistent performance. That design supports stable handling during normal driving and adds damping on demand when load, towing, or larger wheel and tire setups increase suspension demand. This part cross-references Monroe Shocks & Struts (e.g., 911163) for the same application.

What This Shock Absorber Helps Address

• Excessive front-end bounce after bumps or dips
• Reduced steering response from worn OE shocks
• Front suspension fade during towing or hauling
• Loss of control with heavier tires and wheels
• Fluid leakage caused by worn piston rod seals

Installation Notes and Fitment

Compatible With front suspension applications on 1999-2004 Chevrolet Silverado 2500, 2004-2006 Chevrolet Silverado 1500, 2007 Chevrolet Silverado 1500 Classic, 2001-2002 Chevrolet Silverado 1500 HD, 2000-2001 Chevrolet Suburban 2500, 1999-2004 GMC Sierra 2500, 2004-2006 GMC Sierra 1500, 2007 GMC Sierra 1500 Classic, 2001-2003 GMC Sierra 1500 HD, and 2000-2001 GMC Yukon XL 2500. Verify coil spring front suspension and note exclusions for electronic suspension, Quadrasteer, Z55 Autoride, and other listed exceptions before ordering. Compressed length is 10.23 in., extended length is 14.96 in., and stroke length is 4.72 in.; upper mount type is S1 and lower mount type is E3 (51.6 x 87 x 14).

Quality Assurance

KYB designs Gas-a-Just shocks as OE-style monotube replacements for truck applications, with valving and construction matched to the demands of GM platforms. Part number KG54339 is built to restore controlled suspension response while maintaining the original vehicle layout and mounting style.