KYB KG6412 Shock Absorber - Front

KYB Gas-a-Just Front Shock Absorber

The KYB Gas-a-just KG6412 is a front suspension shock absorber built for heavy-duty use on select Chevrolet and GMC chassis applications. Its monotube design separates gas and oil for consistent damping, quicker response, and reduced fade during demanding driving.

For Chevrolet P30 and GMC P3500 motorhome chassis, as well as select Chevrolet G30 and GMC G3500 front applications, this KYB Gas-a-just shock is engineered to add control where OE-style damping can fall short. The KG6412 is a direct-fit suspension shock absorber for vehicles that work, tow, or carry larger wheels and tires.

Key Features

• Adds up to 25% more damping performance over original equipment shocks
• Monotube construction with separate gas and oil chambers for fade-free operation
• High-pressure nitrogen gas provides instant response and improved steering feel
• Ultra-smooth triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Valving and components are tuned for heavy-duty truck and chassis use
• Dust cover included
• Front position fitment for select Chevrolet and GMC applications

Product Details

The KYB Gas-a-just line is designed for drivers who need more control than a conventional twin-tube shock can provide. KG6412 uses an air-free hydraulic working area for responsiveness and a separate high-pressure gas chamber to maintain ride comfort during normal driving while delivering additional damping when conditions demand it. This makes it a practical OE replacement for front suspension service on Chevrolet P30, GMC P3500, Chevrolet G30, and GMC G3500 chassis applications. This part cross-references Monroe Shocks & Struts 557003 for the same application.

What It Helps Address

• Excessive front-end bounce or oscillation
• Reduced steering response on heavy-duty chassis
• Shock fade during extended use or load changes
• Premature seal wear related to fluid leakage
• Loss of control feel with larger tires and wheels

Installation Notes and Fitment

Fits 1985-1999 Chevrolet P30, front, Motorhome Chassis (Exc. Monobeam Front Suspension); Gas-a-just.

Fits 1985-1999 GMC P3500, front, Motorhome Chassis (Exc. Monobeam Front Suspension); Gas-a-just.

Fits 1993-1996 Chevrolet G30, front, Recommended OEM Replacement; (Exc. Motorhome Chassis); Heavy Duty w/ Independent Front (Coil Spring)(P42, P62); Gas-a-just.

Fits 1993-1996 GMC G3500, front, Recommended OEM Replacement; (Exc. Motorhome Chassis); Heavy Duty w/ Independent Front (Coil Spring)(P42, P62); Gas-a-just.

Verify mount style and suspension configuration before installation. Compressed length is 10.47 in., extended length is 15.98 in., and stroke length is 5.51 in. Lower mount type is E2 (12.8 x 35) and upper mount type is E1.

Quality Assurance

KYB designs the Gas-a-just monotube shock absorber for consistent damping performance and durable service in demanding suspension applications. The KG6412 is built to support the braking, steering, and suspension behavior expected by the vehicle manufacturer.