KYB KG54309 Suspension Shock Absorber - Front

KYB Gas-a-just Front Shock Absorber

The KYB Gas-a-just KG54309 is a front monotube shock absorber built for Ford Ranger, Mazda B3000, Mazda B4000, Ford Explorer, Ford Explorer Sport Trac, Ford Explorer Sport, and Mercury Mountaineer applications listed below. It uses a high-pressure gas design to deliver quicker response, firmer control, and fade-resistant damping for trucks and SUVs that work harder than stock.

Gas-a-just is KYB’s performance shock line for drivers who want more control than a conventional twin-tube design. The KG54309 is engineered for front suspension use on select Ford and Mazda platforms, including torsion-bar and performance-oriented OE replacement applications.

• Up to 25% more damping performance over original equipment shocks
• Monotube design separates gas and oil for consistent, fade-free operation
• High gas pressure improves steering response and suspension control
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Designed specifically for Ford truck applications
• Dust cover included
• Part number: KG54309

Detailed Product Overview

KYB KG54309 uses an air-free hydraulic working chamber for responsiveness and a separate high-pressure nitrogen chamber with a floating piston for ride comfort and immediate performance demand. This design supports stable damping under load, especially on vehicles with heavier tires and wheels or frequent towing and work use. The front shock absorber measures 13.58 inches compressed, 18.07 inches extended, and 4.49 inches of stroke, with lower mount type E3(53.6X78X20) and upper mount type S1.

Fits 2001-2011 Ford Ranger, front; Fits 1998-2009 Mazda B4000, front; Fits 2001-2007 Mazda B3000, front; Fits 2001-2005 Ford Explorer Sport Trac, front; Fits 2001-2003 Ford Explorer Sport, front; Fits 1998-2002 Mazda B3000, front; Fits 1995-2001 Ford Explorer, front; Fits 1997-2001 Mercury Mountaineer, front. This part cross-references Monroe Shocks & Struts (e.g., 37122) for the same application.

Common Problems This Shock Can Address

• Excessive front-end bounce after bumps or dips
• Loose steering feel during braking or lane changes
• Reduced control on trucks with heavier wheels and tires
• Shock fade during repeated suspension movement
• Fluid leakage caused by seal wear

Installation Notes and Tips

Verify the vehicle’s front suspension configuration before ordering, especially Ranger and Explorer applications with option-specific suspension packages. Confirm compressed length, extended length, and mount style against the original shock before installation. For best results, inspect related suspension components such as bushings, mounts, and tires while replacing the shock absorber.

Quality Assurance

KYB designs Gas-a-just shocks with monotube construction and application-specific valving for Ford truck and SUV platforms. The KG54309 is built to maintain damping consistency and support the operation of vehicle systems that rely on suspension performance as originally calibrated.