KYB 3440137 Suspension Shock Absorber - Rear

KYB Excel-G Rear Shock for Mazda 6

The KYB Excel-G 3440137 is a rear suspension shock absorber for 2018-2021 Mazda 6 models. It is built to restore original ride control, stability, stopping response, lane-change feel, and handling without changing the vehicle’s factory tuning.

Made 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 Mazda 6 applications, part number 3440137 is an OE-style replacement built around factory performance targets.

Key Features

• Fits 2018-2021 Mazda 6, rear
• KYB Excel-G line calibrated to restore original suspension performance
• Nitrogen gas-charged, twin-tube shock absorber design
• OE-quality components assembled on KYB OE production lines
• Compressed length: 15.55 in; extended length: 24.92 in; stroke length: 9.37 in
• Lower mount type: E2 (14.2x46); upper mount type: S1 (8MM)
• Part number 3440137 for direct catalog identification

Product Details

KYB Excel-G shocks and struts are positioned as Original Equipment for the Aftermarket (OEA), meaning they are built to match the vehicle’s original ride characteristics rather than alter them. For the Mazda 6 rear suspension, this shock absorber is specified to support factory-style control and response while maintaining the vehicle’s intended balance. Part number 3440137 is also a practical reference when searching for a rear shock absorber for 2018-2021 Mazda 6 sedan applications.

This part cross-references Monroe Shocks & Struts (e.g., GBFN28910B, GSH728700) for the same application.

Common Issues It Can Address

• Excessive bouncing after bumps
• Loose or unsettled rear-end handling
• Reduced lane-change responsiveness
• Longer stopping feel caused by worn rear damping
• Uneven ride control from aging shock absorbers

Installation Notes and Tips

Verify rear fitment by matching the vehicle year, model, and mount dimensions before installation. Compare the compressed length, extended length, and stroke length to the removed part to confirm correct suspension travel. Inspect surrounding rear suspension components, including mounts and bushings, for wear before installing the new shock absorber.

Quality Assurance

KYB supplies shocks and struts to new vehicle manufacturers, and the Excel-G line is produced using the same OE manufacturing approach and quality component standards used in KYB’s global OEM programs. That OE-based construction supports consistent fitment and factory-style performance for the Mazda 6 rear suspension.