KYB 339405 Suspension Strut - Front Left

KYB Excel-G Front Left Strut for Mazda 6

The KYB Excel-G suspension strut, part number 339405, is built to restore original ride control and handling on the front left side of select Mazda 6 models. It uses OE-style calibration and vehicle-specific damping to bring steering response, stability, and braking feel back in line with factory performance.

Key Features

• Fits 2014-2017 Mazda 6, front left
• KYB Excel-G line calibrated to restore original suspension performance
• Nitrogen gas-charged twin-tube design
• Triple-lip fluid seal helps reduce oil and gas leakage
• Hand-assembled, vehicle-specific damping valves manage tire contact and body motion
• Strong strut body and bracket design helps maintain alignment under load
• R-stop included; dust cover, internal rebound spring, and B-stop are not included
• Upper mount type: 12X1.25

Product Details

KYB Excel-G is the brand’s OE replacement line for drivers who want factory-style ride control rather than a changed suspension feel. This part number 339405 is made on KYB OE assembly lines using OE-quality components and is classified as an Original Equipment for the Aftermarket replacement. It is engineered for the Mazda 6 front left position to help restore the designed balance between comfort, steering response, and body control. This part cross-references Monroe Shocks & Struts 72939 for the same application.

What This Strut Helps Address

• Excessive bouncing or float after bumps
• Loose steering response during lane changes
• Nose dive and reduced braking stability
• Uneven tire contact caused by worn damping
• Suspension noise or handling changes from a worn front strut

Installation Notes and Tips

Fits 2014-2017 Mazda 6, front left. Replace the suspension strut and coil spring assembly according to the manufacturer’s instructions. Verify spring, mount, and related hardware condition before installation, and confirm the 12X1.25 upper mount thread specification during service. For added protection against road debris, KYB recommends a strut boot, part number SB112.

Quality Assurance

KYB is a major OE supplier of shocks and struts, and the Excel-G line is produced on the same assembly lines used for original equipment components. The design focus is restoring factory ride control, stability, stopping behavior, and handling on Mazda 6 applications.