KYB KG4728 Shock Absorber - Rear

KYB Gas-a-Just Rear Shock for Mercedes-Benz

The KYB Gas-a-Just KG4728 is a rear monotube shock absorber built as an OE-style replacement for select Mercedes-Benz sport suspension applications. It is engineered to restore damping control, steering response, and ride consistency for vehicles that see daily driving, heavier wheel and tire setups, or added load demands.

Gas-a-Just Product Line

KYB Gas-a-Just shocks use a monotube design with separate hydraulic and high-pressure gas chambers. That layout helps deliver responsive control during normal driving while providing firmer damping on demand, making the line a practical choice for Mercedes-Benz C-Class and AMG rear suspension service.

Key Features

• Part number KG4728
• Up to 25% more damping performance than original equipment shocks
• High-pressure monotube construction 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 and suspension control
• Designed specifically for Mercedes-Benz applications
• Includes dust cover
• B-stop and R-stop included
• Lower mount type: E2(10X40); upper mount type: S1
• Compressed length: 14.29 in; extended length: 19.21 in; stroke length: 4.92 in

Detailed Description

KYB KG4728 is a rear suspension shock absorber for Mercedes-Benz C230, C280, C220, and C36 AMG models with sport suspension and without self-leveling. The monotube design uses an air-free hydraulic working area for control and a separate high-pressure nitrogen chamber for fade-resistant operation. This helps maintain stable damping as road conditions change and supports the electronic safety systems that rely on suspension performance staying within manufacturer specifications. This part cross-references Monroe Shocks & Struts 39041 for the same application.

What It Helps Address

• Excessive rear bounce after bumps
• Reduced steering response from worn rear shocks
• Fluid leakage from aging shock seals
• Inconsistent ride control on sport suspension setups
• Loss of damping performance with heavier wheels and tires

Installation Notes and Tips

• Fits 1994-1996 Mercedes-Benz C220, rear
• Fits 1994-2000 Mercedes-Benz C280, rear
• Fits 1997-2000 Mercedes-Benz C230, rear
• Fits 1997 Mercedes-Benz C36 AMG, rear
• Recommended OEM replacement for sport suspension applications without self-leveling
• Replace according to manufacturer instructions and verify mount style before installation
• For the C36 AMG application, replace the suspension strut and coil spring assembly according to manufacturer instructions

Quality Assurance

KYB designs Gas-a-Just shocks as OE monotube replacements to restore original suspension capability and maintain consistent damping performance. The KG4728 is built to KYB application standards for the listed Mercedes-Benz rear fitments.