KYB KG9023 Shock Absorber - Rear

KYB Gas-a-just Rear Shock for Mustang

The KYB Gas-a-just KG9023 is a rear suspension shock absorber built for 1994-2004 Ford Mustang applications. Its monotube design separates gas and oil for quick response, consistent damping, and reduced fade during demanding driving.

For Mustang owners looking for a rear shock upgrade, the Gas-a-just line adds firmer control than many original equipment-style replacements while still maintaining everyday drivability. The KG9023 is engineered for the rear position on the Ford Mustang and is sized for the listed fitment.

Gas-a-just Performance Features

• Adds up to 25% more damping performance over original equipment shocks
• Monotube construction with separate gas and oil chambers for fade-resistant operation
• High-pressure nitrogen gas helps deliver faster response and improved steering feel
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage risk
• Designed specifically for Ford Mustang rear suspension applications
• Includes dust cover and bumper assembly for the listed replacement unit

Detailed Product Overview

The KYB Gas-a-just KG9023 uses an air-free hydraulic working area for control and a high-pressure gas chamber with a floating piston for added responsiveness. That design helps the shock react quickly when the suspension is loaded, which is useful on a Ford Mustang that sees spirited street driving, heavier wheels and tires, or other performance-focused use. This part cross-references Monroe Shocks & Struts (e.g., 5968) and Gabriel (e.g., 75898) for the same application.

Fits 1994-2004 Ford Mustang, rear. The KG9023 is a direct-fit rear shock absorber for the Mustang platform listed in the fitment data, and the KYB Gas-a-just line is built to maintain consistent damping as suspension demands change.

Common Problems This Shock Can Address

• Excessive rear-end bounce after bumps or dips
• Reduced damping control from worn original shocks
• Delayed response during lane changes or cornering
• Fade from heat and repeated suspension movement
• Loss of stability with larger, heavier wheels and tires

Installation Notes and Tips

Verify rear-position fitment before installation and compare the compressed length, extended length, and mount types to the original shock. The KG9023 uses an E2(12X38) lower mount and S1(12MM) upper mount, with a compressed length of 13.74 inches, extended length of 19.61 inches, and stroke length of 5.87 inches. Inspect surrounding suspension components, bump stops, and mounting points for wear before replacing the shock.

Fits 1994-2004 Ford Mustang, rear. For best results, replace shocks in matched axle pairs and confirm that the vehicle’s rear suspension is in proper alignment after service.

Quality Assurance

KYB designs the Gas-a-just line with monotube construction, high-pressure gas separation, and valving intended to deliver consistent control under changing road conditions. The KG9023 includes a dust cover, B-stop, and R-stop as listed in the product data.