KYB KG4504 Shock Absorber - Front

KYB Gas-a-just Front Shock for Mustang and Cougar

The KYB Gas-a-just KG4504 is a front suspension shock absorber built for 1971-1973 Ford Mustang and 1971-1973 Mercury Cougar applications. Its monotube design delivers quick response, consistent damping, and improved control for drivers who want firmer suspension performance without sacrificing everyday ride quality.

Gas-a-just Performance Line

KYB Gas-a-just shocks use a high-pressure monotube layout with separate gas and oil chambers. That design helps maintain fade-free operation, supports instant damping response, and adds control when the vehicle is carrying heavier wheels and tires or sees more demanding driving conditions. The Gas-a-just line is aimed at vehicles that work harder than stock and need more suspension authority.

Key Features

• Adds up to 25% more damping performance over original equipment shocks
• Engineered for Mustang and Cougar front suspension applications
• High-pressure monotube construction separates gas and oil for consistent response
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Higher gas pressure improves steering response
• Supports electronic safety systems by helping the suspension operate as designed
• Part number KG4504 for easy catalog matching

Detailed Description

KYB KG4504 is a front suspension shock absorber designed for 1971-1973 Ford Mustang and 1971-1973 Mercury Cougar models. The monotube design uses an air-free hydraulic working area for control and a high-pressure nitrogen gas chamber with a floating piston for responsive damping. This setup helps the shock react quickly to road inputs and maintain performance under repeated use. For shoppers searching for a front shock absorber for 1971-1973 Mustang or a KYB Gas-a-just front shock for 1971-1973 Cougar, KG4504 provides a direct-fit performance-oriented option.

This part cross-references Monroe Shocks & Struts 5823 for the same application.

What It Helps Address

• Excessive front-end bounce after bumps
• Reduced steering response during lane changes or cornering
• Shock fade from repeated suspension movement
• Control loss with heavier tires and wheels
• Wear-related fluid leakage from aging shock absorbers

Installation Notes and Tips

Fits 1971-1973 Ford Mustang, front. Fits 1971-1973 Mercury Cougar, front. Verify upper and lower mount types before installation, since this application uses a special lower mount and S1 upper mount. Confirm compressed length, extended length, and stroke length against the vehicle’s suspension travel before final assembly. Professional installation is recommended for proper suspension performance and alignment verification.

Quality Assurance

KYB designs Gas-a-just shocks with a triple chrome plated piston rod and monotube construction to support consistent operation and reduced seal wear. The KG4504 is built to meet the demands of classic Mustang and Cougar front suspension service.