KYB KG5409 Suspension Shock Absorber - Front

KYB Gas-a-Just Front Shock Absorber

The KYB Gas-a-Just KG5409 is a monotube front shock absorber built for older GM trucks, vans, and SUVs that need firmer control than a standard twin-tube design. It uses separate gas and oil chambers for quick response, consistent damping, and reduced fade during demanding driving.

Compatible With 1967-1999 Chevrolet and GMC front suspension applications, including Chevrolet C10, C20, C30, K5 Blazer, P30, G10, G20, G30, and GMC C1500, C2500, C3500, G1500, G2500, G3500, Jimmy, and P3500 models. This part number, KG5409, is a direct-fit performance upgrade for many front-end service jobs on GM truck platforms.

Key Features

• Monotube Gas-a-Just design for faster response and more consistent damping
• Up to 25% more damping performance over original equipment shocks
• High-pressure nitrogen gas separates from the oil to reduce fade from aeration
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Designed specifically for GM truck applications
• Dust cover included
• Lower mount type: E2(12.8X35); upper mount type: E2(16X35)
• Compressed length: 9.88 in; extended length: 14.88 in; stroke length: 5 in

Product Details

KYB Gas-a-Just shocks are built around a high-pressure monotube layout that keeps the gas and hydraulic oil in separate working chambers. That construction supports fade-free operation and immediate damping response, which is useful on Chevrolet C10, GMC C1500, and similar front suspension setups where steering feel and body control matter. The KG5409 is also a strong choice for vehicles that work, tow, or run larger wheels and tires.

This part cross-references Monroe Shocks & Struts 37049 and Gabriel 77359 for the same application.

Common Problems This Shock Can Address

• Excessive front-end bounce after bumps or dips
• Loose steering feel on worn GM truck suspension
• Shock fade during repeated load changes or rough-road driving
• Reduced control on vehicles with heavier tires and wheels
• Fluid leakage caused by seal wear on aging shocks

Installation Notes

• Install on the front position only for the listed applications.
• Verify mount style and compressed/extended length before installation.
• Check surrounding suspension components, bushings, and hardware for wear before replacing shocks.
• Use the vehicle-specific fitment notes for exclusions such as motorhome chassis, heavy-duty chassis, monobeam front suspension, and camper conversion applications.

Quality Assurance

KYB engineers the Gas-a-Just line for direct suspension control on GM truck platforms, with valving and components matched to the application. The monotube design and high-pressure gas charge are used to maintain consistent damping and support electronic safety systems that rely on proper suspension behavior.