KYB KG4549 Shock Absorber - Rear

KYB Gas-a-just Rear Shock for Saab 9000

The KYB Gas-a-just KG4549 is a rear suspension shock absorber for the 1986-1998 Saab 9000, excluding self-leveling rear applications. Built as an OE monotube replacement, it restores controlled damping for daily driving while adding quicker response when the suspension is working harder.

For Saab 9000 owners looking for a rear shock absorber that matches original mounting points and improves control, the KYB Gas-a-just KG4549 is engineered around the vehicle’s suspension needs. It is a direct-fit rear replacement for the Saab 9000 and is designed to deliver consistent damping with reduced fade under load.

Key Features

• Fits 1986-1998 Saab 9000, rear
• OE-style monotube shock absorber replacement
• Up to 25% more damping performance than original equipment shocks
• High-pressure nitrogen gas and hydraulic working chambers for responsive control
• Separate gas and oil chambers help maintain fade-free operation
• Triple chrome plated piston rod helps reduce seal wear
• Designed for vehicles that tow, carry loads, or use larger wheels and tires
• Dust cover included
• B-stop and R-stop included in the design
• Lower mount type: E2(12X39.5); upper mount type: S1

Product Details

The Gas-a-just line uses a monotube design with an air-free hydraulic piston area for control and a separate high-pressure nitrogen gas chamber with a floating piston. That layout supports quick response, stable damping, and consistent performance during normal driving and under heavier suspension demand. The KYB Gas-a-just KG4549 is a strong rear shock choice for the Saab 9000 when original ride control has softened or when the vehicle needs firmer damping at the rear.

This part cross-references Monroe Shocks & Struts 39012 for the same application.

Common Problems This Shock Can Address

• Rear-end bounce or excessive oscillation over bumps
• Reduced steering response caused by worn suspension damping
• Shock fade during repeated compression and rebound cycles
• Fluid leakage from worn shock seals
• Loose or unsettled rear ride quality on a Saab 9000

Installation Notes

• Fits 1986-1998 Saab 9000, rear, excluding self-leveling rear systems.
• Verify compressed length, extended length, and stroke before installation: 15.28 in compressed, 22.56 in extended, 7.28 in stroke.
• Confirm upper and lower mount types match the vehicle before removal of the original shock.
• Inspect surrounding suspension components, bushings, and mounts during replacement.

Quality Assurance

KYB designs the Gas-a-just line as an OE monotube replacement to restore original suspension capability with improved damping response. The KG4549 is built for the rear of the Saab 9000 and uses a high-pressure monotube layout to support consistent control and reduced fade in service.