KYB KG5787A Shock Absorber - Rear

KYB Gas-a-Just Rear Shock for Nissan 300ZX

The KYB Gas-a-Just KG5787A is a rear suspension shock absorber built as an OE-style monotube replacement for the Nissan 300ZX. It is engineered to restore original damping control while adding quicker response for drivers who want firmer control during normal street use and under heavier load conditions.

Fits 1984-1989 Nissan 300ZX, rear. This part cross-references Monroe Shocks & Struts (e.g., 5928) for the same application.

Key Features

• Adds up to 25% more damping performance over original equipment shocks
• Monotube design separates gas and oil for consistent response and fade resistance
• High-pressure nitrogen gas chamber improves steering response and control
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Valving and components are tuned specifically for the Nissan 300ZX
• Built for vehicles that work, tow, or use larger, heavier tires and wheels
• Electronic safety systems can benefit from suspension performance that stays closer to factory intent
• Compatible with KYB strut boot SB107 for added protection from dirt, debris, and salt

Product Details

The Gas-a-Just line is KYB’s high-pressure monotube shock absorber series, designed to deliver responsive damping through a separate hydraulic working area and gas chamber. On the KG5787A, that layout helps maintain control during repeated suspension movement and supports a more immediate reaction to steering and road inputs. With a compressed length of 15.2 inches, extended length of 24.02 inches, and 8.82 inches of stroke, this rear shock is matched to the 1984-1989 Nissan 300ZX platform and its OE replacement requirements. The KG5787A is also referenced by part number KG5787A for easy catalog matching.

Common Problems It Can Help Address

• Excessive rear-end bounce after bumps or dips
• Reduced damping control from worn factory shocks
• Delayed steering response caused by weak suspension control
• Fluid leakage from aging shock seals
• Loss of ride stability on heavier wheels, tires, or loaded driving

Installation Notes and Tips

Verify rear fitment against the vehicle’s suspension configuration before installation. This shock is listed for 1984-1989 Nissan 300ZX rear applications, except vehicles with adjustable suspension, and conversion from electronic suspension requires the correct catalog reference. Confirm upper mount type S1 and lower mount type E2(12X60) during replacement, and inspect related bushings and mounting points for wear before final assembly.

Quality Assurance

KYB designs the Gas-a-Just line as an OE monotube replacement to restore factory-style suspension capability with added damping response. The KG5787A uses a high-pressure monotube construction, a triple chrome plated piston rod, and application-specific valving for the Nissan 300ZX to support consistent operation in rear suspension service.