KYB KG4729 Shock Absorber - Front

KYB Gas-a-Just Front Shock Absorber

The KYB Gas-a-Just KG4729 is a front suspension shock absorber built as an OE-style monotube replacement for select Mercedes-Benz applications. It is designed to restore original ride control while adding quicker response for vehicles that see harder use, including sport suspension setups.

For Mercedes-Benz C230, C280, C36 AMG, and C220 front suspension service, the Gas-a-Just line focuses on controlled damping, stable steering response, and consistent performance under load. Part number KG4729 is engineered for the front position and matches the fitment and mounting requirements listed below.

Key Features

• Monotube shock design with separate gas and oil chambers for consistent damping
• Up to 25% more damping performance than original equipment shocks
• Higher gas pressure for faster steering response and improved control
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Built for Mercedes-Benz-specific valving and component tuning
• Designed for vehicles with sport suspension, heavier wheels, or towing demands
• Dust cover included
• B-stop and R-stop included

Product Details

KYB Gas-a-Just shocks use a high-pressure monotube layout with an air-free hydraulic working area and a separate nitrogen gas chamber. That construction supports fade-resistant operation and immediate response when suspension demand increases. On Mercedes-Benz C230, C280, C36 AMG, and C220 front applications, KG4729 is a direct-fit suspension shock absorber intended to maintain the vehicle’s original handling balance while improving control over worn OE units.

This part cross-references Monroe Shocks & Struts 39046 for the same application.

Common Problems This Part Can Address

• Excessive front-end bounce after bumps or dips
• Loose or delayed steering response
• Reduced control with sport suspension or larger wheels
• Shock fade during repeated suspension movement
• Oil leakage from a worn front shock absorber

Installation Notes

Fits 1997-2000 Mercedes-Benz C230, front, recommended OEM replacement; w/ Sport Suspension (Exc. Self Leveling). Fits 1994-2000 Mercedes-Benz C280, front, recommended OEM replacement; w/ Sport Suspension (Exc. Self Leveling). Fits 1997 Mercedes-Benz C36 AMG, front, replace suspension strut and coil spring assembly according to manufacturer's instructions. Fits 1994-1996 Mercedes-Benz C220, front, recommended OEM replacement; w/ Sport Suspension (Exc. Self Leveling).

Verify the vehicle’s suspension configuration before installation, especially self-leveling and sport suspension equipment. Replace and torque fasteners according to Mercedes-Benz service procedures, and inspect related suspension components for wear before returning the vehicle to service.

Quality Assurance

KYB designs the Gas-a-Just line as an OE monotube replacement with application-specific valving for Mercedes-Benz front suspension use. The KG4729 is built to support consistent damping, stable ride control, and proper operation of vehicle systems that depend on suspension performance.