KYB KG6407 Shock Absorber - Front

KYB Gas-a-Just Front Shock Absorber

The KYB Gas-a-just KG6407 is a front suspension shock absorber built for heavy-duty use on Chevrolet and GMC motorhome chassis and conversion vans. Its monotube design separates gas and oil for consistent damping, quicker response, and reduced fade during demanding driving.

For owners searching for a KYB Gas-a-just front shock absorber for Chevrolet G30, GMC G3500, or P30/P3500 motorhome applications, KG6407 delivers firmer control than many original-equipment-style shocks while maintaining ride comfort in normal driving.

Key Features

• Monotube shock design with separate gas and oil chambers for fade-resistant operation
• Up to 25% more damping performance than original equipment shocks
• Valving and components tuned for heavy-duty trucks and motorhome chassis
• High-pressure nitrogen gas helps deliver immediate response and improved steering feel
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Dust cover included
• Front position fitment for select Chevrolet and GMC applications

Product Details

The Gas-a-Just line is KYB’s performance-oriented monotube shock family. This design uses a high-pressure gas chamber with a floating piston to keep the hydraulic fluid aerated less often than a traditional twin-tube shock, which helps maintain damping consistency under load. The KG6407 is sized with a compressed length of 9.88 inches, an extended length of 14.8 inches, and a stroke length of 4.92 inches. Mounting dimensions are E2(12.8x35) at the lower mount and E2(16x35) at the upper mount.

Fits 1975-1996 Chevrolet G30, front, w/ Motorhome Conversion; Gas-a-just. Fits 1979-1996 GMC G3500, front, w/ Motorhome Conversion; Gas-a-just. Fits 1975-1984 Chevrolet P30, front, Motorhome Chassis; Gas-a-just. Fits 1979-1984 GMC P3500, front, Motorhome Chassis; Gas-a-just. Fits 1975-1978 GMC G35, front, w/ Motorhome Conversion; Gas-a-just. Fits 1970-1974 GMC G35/G3500 Van, front, w/ Motorhome Conversion; Gas-a-just.

This part cross-references Monroe Shocks & Struts 34817 for the same application.

Common Problems This Shock Can Address

• Excessive front-end bounce on motorhome chassis and conversion vans
• Reduced steering response from worn or weak shocks
• Suspension fade during long-distance driving or heavy load conditions
• Uneven control over larger, heavier tires and wheels
• Loss of damping consistency caused by aging OE shocks

Installation Notes

Verify compressed length, extended length, and mount style before installation. This KG6407 is a front shock absorber, so confirm the vehicle is listed for front position fitment and matches the motorhome conversion or motorhome chassis notes shown above. Inspect related suspension components, mounting points, and bushings before replacing the shock.

Quality Assurance

KYB designs the Gas-a-Just line for demanding truck and motorhome service, with monotube construction that supports consistent damping and quick response. The triple chrome plated piston rod and high-pressure gas design are used to help reduce seal wear and maintain performance over time.