KYB KG5555 Shock Absorber - Rear

KYB Gas-a-just Rear Shock Absorber

The KYB Gas-a-just KG5555 is a rear monotube shock absorber built for classic GM cars that need firmer control and consistent damping. It is engineered for vehicles such as the Buick Century, Chevrolet Celebrity, Oldsmobile Cutlass Ciera, and Pontiac 6000, with performance-focused valving for rear suspension service.

Key Features

• Monotube design separates gas and oil for fade-resistant operation and quick response.
• Provides up to 25% more damping performance than original equipment shocks.
• High-pressure nitrogen gas helps maintain control during normal driving and sudden load changes.
• Triple chrome plated piston rod is designed to reduce seal wear and fluid leakage.
• Built for classic GM applications, including rear suspension use on Buick Century and Chevrolet Celebrity models.
• Dust cover included; B-stop included.
• Part number KG5555 for easy identification and ordering.

Product Details

Gas-a-just is KYB’s performance monotube line, using separate working chambers for hydraulic control and gas pressure response. That layout helps the shock react quickly to steering and road inputs while maintaining a comfortable ride in everyday driving. For rear suspension applications on older GM platforms, the KG5555 is a direct-fit shock absorber choice for drivers replacing worn OE units or upgrading from a softer twin-tube design. This part cross-references Monroe Shocks & Struts (e.g., 37071) for the same application.

Common Problems This Shock Can Address

• Excessive rear bounce after bumps or dips
• Reduced body control during cornering or lane changes
• Shock fade from heat or aeration in demanding driving
• Rear-end instability on vehicles with heavier wheels or tires
• Fluid leakage from worn shock seals

Installation Notes and Fitment

Fits 1982-1996 Buick Century, rear; 1982-1990 Chevrolet Celebrity, rear; 1984-1985 Chevrolet Citation II, rear; 1980-1983 Chevrolet Citation, rear; 1994-1996 Chevrolet Lumina APV, rear; 1980-1985 Buick Skylark, rear; 1980-1984 Oldsmobile Omega, rear; 1987-1994 Oldsmobile Cutlass Cruiser, rear; 1982-1996 Oldsmobile Cutlass Ciera, rear; 1994-1996 Oldsmobile Silhouette, rear; 1980-1984 Pontiac Phoenix, rear; 1982-1991 Pontiac 6000, rear; and 1990-1996 Pontiac Trans Sport, rear.

Before installation, confirm rear suspension configuration and note that some applications with electronic suspension, leveling control, or air suspension require separate reference. KYB recommends replacing strut mounts where applicable to reduce noise and vibration; for this shock absorber, verify all mounting points and dimensions match the vehicle before service. Compressed length is 14.17, extended length is 21.06, and stroke length is 6.89.

Quality Assurance

KYB designs Gas-a-just shocks with monotube construction, high-pressure gas separation, and valving intended for consistent damping performance in classic GM rear suspension applications. The KG5555 is engineered to support steering response and suspension control while maintaining OE-style fitment for the listed vehicles.