KYB 3440173 Suspension Shock Absorber - Rear

KYB Excel-G Rear Shock for INFINITI QX50

The KYB Excel-G rear shock absorber, part number 3440173, is built to restore original ride control, stability, and handling response on the 2016-2017 INFINITI QX50. This nitrogen gas-charged, twin-tube shock uses OE-quality components and OE-style calibration for a direct replacement focused on factory performance.

Key Features

• Fits 2016-2017 INFINITI QX50, rear
• KYB Excel-G OEA-style replacement for original ride characteristics
• Nitrogen gas-charged, twin-tube shock absorber design
• Compressed length: 15.82 in; extended length: 20.37 in; stroke length: 4.55 in
• Lower mount type: E2 (14x44.5); upper mount type: S1 (12MM)
• Part number 3440173 for rear suspension service

Product Details

KYB Excel-G is the brand’s OE-focused product line for drivers who want factory-style suspension response rather than a changed ride feel. For the INFINITI QX50 rear suspension, part number 3440173 is calibrated to match the vehicle’s original control characteristics, helping maintain predictable braking, lane-change response, and overall handling balance. KYB manufactures Excel-G on the same OE assembly lines used for original equipment applications, using quality components aligned with OEM standards.

This rear shock absorber is a direct service part for 2016-2017 INFINITI QX50 models and is a practical choice when the goal is to restore the vehicle’s original suspension behavior. Part number 3440173 is also a useful reference when comparing rear shock absorber options for the INFINITI QX50.

What It Can Address

• Excessive rear bounce or oscillation
• Reduced stability during braking and cornering
• Loose or unsettled rear suspension feel
• Slower response during lane changes
• Uneven ride control from worn shock absorber performance

Installation Notes

Verify rear fitment by matching the compressed length, extended length, stroke length, and mount types before installation. This shock uses an E2 lower mount (14x44.5) and an S1 upper mount (12MM). Dust cover is not included, so reuse or replace related components as needed during suspension service. Professional installation and a post-installation alignment check are recommended after rear shock replacement on the INFINITI QX50.

Quality Assurance

KYB is a major OE shock and strut supplier, and the Excel-G line is built to OE-style standards for restoring original suspension performance. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.