KYB KG5504 Shock Absorber - Rear

KYB Gas-a-Just Rear Shock for Classic GM

The KYB Gas-a-Just KG5504 is a monotube rear shock absorber built for classic GM cars that need firmer control, quicker response, and consistent damping. It is a direct fit for a wide range of rear applications on Chevrolet, Buick, Oldsmobile, and Pontiac models from the 1960s through the 1990s.

Gas-a-Just shocks use a high-pressure monotube design with separate gas and oil chambers for fast reaction and fade-resistant operation. For vehicles with heavier wheels and tires, towing use, or performance-oriented suspension needs, the KG5504 adds damping authority without sacrificing normal-road comfort.

Key Features

• Up to 25% more damping performance than original equipment shocks
• Monotube construction separates gas and oil for consistent response
• High-pressure nitrogen gas supports instant adjustment under changing road conditions
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Designed specifically for classic GM rear suspension applications
• Improves steering response and suspension control
• Dust cover included

Product Details

KYB Gas-a-Just line shocks are engineered for drivers who want more control from the rear suspension without changing the vehicle’s basic ride height or layout. The KG5504 measures 12.56 inches compressed, 20.04 inches extended, and provides 7.48 inches of stroke. Mounting is E1 at the lower end and E3 (61.6 x 87 x 20) at the upper end.

This part cross-references Monroe Shocks & Struts 5802 and Gabriel 69604 for the same application. It is a strong match for rear shock replacement on vehicles such as the Chevrolet Caprice, Buick Roadmaster, and Pontiac Grand Prix when a monotube performance upgrade is desired.

Common Problems It Can Address

• Excessive rear-end bounce over bumps and dips
• Reduced control during cornering or lane changes
• Soft or worn OE shock performance on heavier classic GM cars
• Fade from repeated suspension heat buildup
• Loose rear suspension feel with larger wheels and tires

Installation Notes

Compatible With rear shock applications on classic GM platforms including Chevrolet Caprice, Buick Roadmaster, Oldsmobile Custom Cruiser, Pontiac Bonneville, Pontiac Catalina, Pontiac Grand Prix, Chevrolet El Camino, and related models listed in the fitment data. Verify compressed length, extended length, and mount style before installation to confirm proper suspension travel and fitment. The dust cover is included; internal rebound spring and B-stop are not included.

Fits 1991-1996 Buick Roadmaster, Rear. Fits 1977-1996 Chevrolet Caprice, Rear. Fits 1968-1977 Pontiac LeMans, Rear. Fits 1968-1977 Oldsmobile Cutlass Supreme, Rear. Fits 1969-1977 Pontiac Grand Prix, Rear.

Quality Assurance

KYB is known for suspension components engineered to maintain predictable damping and stable vehicle control. The Gas-a-Just design uses a high-pressure monotube layout to separate gas and oil, reducing fade and supporting consistent rear shock performance in demanding driving conditions.