KYB KG5490 Suspension Shock Absorber - Rear

KYB Gas-a-just Rear Shock for Explorer, Mountaineer, Navajo

The KYB Gas-a-just KG5490 is a rear suspension shock absorber built for Ford Explorer, Explorer Sport, Explorer Sport Trac, Mercury Mountaineer, and Mazda Navajo applications. Its monotube design separates gas and oil for quick response, consistent damping, and reduced fade during demanding driving.

Key Features

• Up to 25% more damping performance than original equipment shocks
• Monotube construction with separate gas and oil chambers for fade-free operation
• High-pressure nitrogen gas helps deliver faster steering response and control
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Valving and components are tuned for trucks and heavier-duty use
• Dust cover included
• Rear position application

Product Details

Gas-a-just is KYB’s performance-oriented shock line for vehicles that work, tow, or run larger wheels and tires. The KG5490 uses an air-free hydraulic working area for responsiveness and a separate high-pressure gas chamber with a floating piston to maintain ride comfort during normal driving while adding damping on demand. For 1991-2005 Ford Explorer, 1997-2001 Mercury Mountaineer, and 1991-1994 Mazda Navajo rear suspension service, this shock provides a direct-fit monotube upgrade focused on control and stability. This part cross-references Monroe Shocks & Struts 911035 for the same application.

What This Shock Helps Address

• Excessive rear bounce after bumps or dips
• Reduced control when towing or carrying heavier loads
• Shock fade from heat and aeration during repeated suspension movement
• Loose or delayed steering response caused by worn rear damping
• Ride instability on trucks with larger, heavier tires and wheels

Installation Notes and Fitment

Fits 2001-2005 Ford Explorer Sport Trac, rear. Fits 2001-2003 Ford Explorer Sport, rear. Fits 1995-2001 Ford Explorer, rear, excluding adjustable suspension. Fits 1997-2001 Mercury Mountaineer, rear, excluding electronic adjustable suspension. Fits 1991-1994 Ford Explorer, rear. Fits 1991-1994 Mazda Navajo, rear. Verify compressed length, extended length, and mount style before installation: compressed length 15.79, extended length 25.79, stroke length 10, lower mount E2(12X38), upper mount E3(61.6X87X0). Professional installation and a post-installation inspection of suspension hardware are recommended.

Quality Assurance

KYB designs Gas-a-just shocks with monotube construction and high-pressure gas separation to maintain consistent damping performance. The KG5490 is engineered for rear suspension service on the listed Ford, Mercury, and Mazda applications.