KYB 3440143 Suspension Shock Absorber - Rear

KYB Excel-G Rear Shock for Optima

The KYB Excel-G 3440143 is a rear suspension shock absorber for 2016-2018 Kia Optima models built in Korea. It is calibrated to restore original ride control, stability, stopping response, lane-change responsiveness, and handling without changing the vehicle’s intended feel.

Built on KYB OE assembly lines, the Excel-G line uses OE-quality components and a nitrogen gas-charged, twin-tube design. For drivers and technicians looking for a rear shock absorber for a 2016-2018 Kia Optima, KYB 3440143 is an OE-style replacement focused on restoring factory performance.

Key Features

• Part number: 3440143
• Brand line: KYB Excel-G
• Rear suspension shock absorber
• Fits 2016-2018 Kia Optima, rear
• Korea built application
• Nitrogen gas-charged, twin-tube construction
• Compressed length: 18.31 in.
• Extended length: 25.28 in.
• Stroke length: 6.97 in.
• Lower mount type: E2 (14.2x60)
• Upper mount type: S1 (10MM)

Excel-G Product Line Details

KYB Excel-G is the company’s OE replacement line for restoring original suspension behavior. It is produced on the same KYB manufacturing lines used for original equipment supply and uses components selected to match the vehicle’s designed ride control characteristics. For the Kia Optima rear shock application, that means a direct-focus replacement for factory-style handling and stability.

Detailed Description

KYB 3440143 is a rear shock absorber for the 2016-2018 Kia Optima, Korea built. The dimensions and mount configuration are listed to support correct replacement selection: 18.31-inch compressed length, 25.28-inch extended length, 6.97-inch stroke, E2 lower mount, and S1 upper mount. This part cross-references Monroe Shocks & Struts (e.g., 172286) for the same application.

What It Helps Address

• Excessive rear bounce after bumps
• Reduced rear-end stability during braking
• Loose or unsettled handling in lane changes
• Uneven ride control from worn rear shocks
• Loss of factory-like damping response

Installation Notes and Tips

Verify the vehicle is a 2016-2018 Kia Optima, rear, and confirm the Korea-built configuration before ordering. Match the compressed length, extended length, stroke length, and mount types to the original part. Replace shocks in pairs on the same axle when service procedures call for matched damping, and inspect related suspension components for wear during installation.

Quality Assurance

KYB is a major OE shock and strut supplier, and Excel-G is built on KYB OE assembly lines using OE-quality components. The design focus is restoring original vehicle performance for the rear suspension of the Kia Optima rather than altering ride characteristics.