KYB 551606 Suspension Strut - Front

KYB Gas-a-just Front Strut for Cadillac STS

The KYB Gas-a-just 551606 is a front suspension strut built as an OE-style monotube replacement for the 2005-2009 Cadillac STS, excluding Magnetic Ride Control. It is engineered to restore original steering response, ride control, and suspension behavior for daily driving and heavier-duty use.

Gas-a-just Product Line

KYB Gas-a-just struts use a monotube design with separate gas and oil chambers. That layout supports quick response, consistent damping, and fade-resistant operation when the suspension is working harder than stock, including towing, hauling, and vehicles with larger, heavier tires and wheels.

Key Features

• OE replacement monotube strut for the front suspension
• Restores designed control and handling on Cadillac STS models
• High-pressure nitrogen gas design separates gas and oil for consistent response
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Higher gas pressure improves steering response
• Supports electronic safety systems by helping the suspension operate as engineered
• Part number 551606 for easy catalog matching

Detailed Description

KYB 551606 is a front suspension strut for 2005-2009 Cadillac STS models with standard suspension and without Magnetic Ride Control. The Gas-a-just monotube construction uses an air-free hydraulic working area for control and a separate high-pressure nitrogen chamber for immediate response. This design is suited to Cadillac STS vehicles that see regular road use as well as added load from towing, heavier wheels, or larger tires. This part cross-references Monroe Shocks & Struts (e.g., 39135) for the same application.

Common Problems It Can Address

• Excessive front-end bounce or float
• Slow steering response
• Reduced handling control during braking and cornering
• Suspension fade under heavier driving demands
• Oil seepage associated with worn strut seals

Installation Notes and Tips

Compatible With 2005-2009 Cadillac STS, front. Verify that the vehicle is not equipped with Magnetic Ride Control before ordering. Confirm the upper mount thread specification and all suspension dimensions against the original strut before installation. After replacement, inspect alignment settings and related front suspension components for wear.

Quality Assurance

KYB is a major OE suspension supplier, and the Gas-a-just line is built to match original equipment-style performance targets for control, response, and ride consistency.