KYB KG5548 Shock Absorber - Rear

KYB Gas-a-just Rear Shock for GM Performance

The KYB Gas-a-just KG5548 is a rear suspension shock absorber built for GM cars that need firmer control, quicker response, and stable damping under load. It is a monotube design that separates gas and oil for consistent operation, making it a strong choice for Chevrolet Monte Carlo, Buick Regal, Oldsmobile Cutlass, Pontiac Grand Prix, and related rear applications.

Key Features

• Monotube construction delivers up to 25% more damping performance than original equipment shocks.
• High-pressure gas and oil separation supports fade-free operation and immediate response.
• Valving and components are engineered specifically for GM cars.
• Higher gas pressure improves steering response and suspension control.
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage.
• Dust cover included for added protection.
• Compatible with vehicles that work, tow, or run larger, heavier tires and wheels.

Product Details

The Gas-a-just line is KYB’s performance-oriented monotube shock absorber series, designed to react quickly when suspension demands change. Unlike a twin-tube design, the KG5548 uses separate working chambers with an air-free hydraulic area for control and a high-pressure nitrogen chamber for consistent ride quality. That layout helps maintain damping performance during repeated suspension movement, which is important on rear applications such as the Chevrolet Monte Carlo, Buick Regal, and Pontiac Grand Prix. The KYB KG5548 is also a practical OE-style upgrade for drivers looking to restore rear suspension control without changing the vehicle’s basic ride characteristics.

This part cross-references Monroe Shocks & Struts 5955 for the same application.

What It Helps Address

• Excessive rear-end bounce after bumps or dips
• Reduced control during acceleration, braking, or cornering
• Shock fade from repeated suspension movement
• Loose or unstable rear ride feel on heavier setups
• Wear-related loss of damping performance

Installation Notes and Fitment

Fits 1978-1988 Chevrolet Monte Carlo, rear. Fits 1978-1987 Chevrolet El Camino, rear. Fits 1978-1983 Chevrolet Malibu, rear. Fits 1984-1987 Buick Regal, rear. Fits 1978-1987 Buick Regal, rear. Fits 1978-1981 Buick Century, rear. Fits 1978-1988 Oldsmobile Cutlass Supreme, rear. Fits 1985-1987 Oldsmobile Cutlass, rear. Fits 1978-1981 Oldsmobile Cutlass, rear. Fits 1985-1987 Oldsmobile Cutlass Salon, rear. Fits 1978-1980 Oldsmobile Cutlass Salon, rear. Fits 1978-1984 Oldsmobile Cutlass Calais, rear. Fits 1980-1983 Oldsmobile Cutlass Cruiser, rear. Fits 1978-1987 Pontiac Grand Prix, rear. Fits 1982-1986 Pontiac Bonneville, rear. Fits 1978-1983 Pontiac Grand LeMans, rear. Fits 1978-1981 Pontiac LeMans, rear. Fits 1978-1980 Pontiac Grand Am, rear.

Install according to manufacturer instructions and verify the lower mount type E1 and upper mount type E3 (61.6 x 87 x 0) before assembly. This rear shock absorber is listed for GM rear suspension applications and is commonly selected when replacing a worn OE shock on Chevrolet Monte Carlo, Buick Regal, or Pontiac Grand Prix models.

Quality Assurance

KYB designs the Gas-a-just line with a monotube layout, high-pressure gas separation, and a chrome piston rod to support consistent damping and reduced seal wear. The KG5548 is built for direct-fit rear suspension service in confirmed GM applications and is backed by KYB’s product engineering standards.