KYB KG4513 Shock Absorber - Front

KYB Gas-a-Just Front Shock Absorber

The KYB Gas-a-just KG4513 is a front monotube shock absorber built for classic GM and Pontiac applications that need firmer control and consistent damping. It is engineered to respond quickly during normal driving and add performance when road conditions or vehicle demands increase.

Compatible With 1968-1988 Chevrolet Monte Carlo, 1968-1987 Chevrolet El Camino, 1973-1983 Chevrolet Malibu, 1968-1988 Oldsmobile Cutlass Supreme, 1968-1987 Oldsmobile Cutlass, 1975-1980 Oldsmobile Cutlass Salon, 1978-1984 Oldsmobile Cutlass Calais, 1980-1983 Oldsmobile Cutlass Cruiser, 1973-1987 Buick Regal, 1984-1987 Buick Regal, 1973-1981 Buick Century, 1968-1972 Buick Skylark, 1969-1987 Pontiac Grand Prix, 1982-1986 Pontiac Bonneville, 1975-1983 Pontiac Grand LeMans, 1968-1981 Pontiac LeMans, 1978-1980 Pontiac Grand Am, 1973-1975 Pontiac Grand Am, 1968-1973 Pontiac GTO, 1968-1970 Pontiac Tempest, 1976-1979 Cadillac Seville, and 1988 Pontiac Fiero, front.

• Monotube design separates gas and oil for fade-resistant operation and fast response
• Up to 25% more damping performance than original equipment shocks
• Higher gas pressure improves steering response and road control
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Valving and components are tuned for classic cars and heavier wheel and tire setups
• Part number KG4513 for front suspension service on supported applications

The Gas-a-Just line is KYB’s performance-oriented monotube shock family. On vehicles such as the Chevrolet Monte Carlo, Oldsmobile Cutlass, and Pontiac Grand Prix, KG4513 adds firmer damping without relying on a twin-tube layout, which helps maintain control during braking, cornering, and repeated suspension movement. This part cross-references Monroe Shocks & Struts (e.g., 5840) for the same application.

Common Problems This Shock Can Address

• Excessive front-end bounce after bumps or dips
• Reduced steering response from worn OE shocks
• Shock fade during repeated suspension loading
• Fluid leakage caused by seal wear on aging suspension parts
• Loose or unsettled ride quality on classic cars with larger tires and wheels

Installation Notes and Fitment Tips

Install KG4513 at the front position only on the listed applications. Some fitments note monotube shock installation, while 1984-1987 Buick Regal applications note replacement of the suspension strut and coil spring assembly according to the manufacturer’s instructions. Verify compressed length, extended length, stroke, and mount types before installation to confirm proper suspension travel and mounting alignment.

Quality Assurance

KYB designs the Gas-a-just line with a high-pressure monotube construction and precision valving for consistent damping performance. The triple chrome plated piston rod is used to support seal durability and long-term operation in demanding front suspension service.