Bring settled, controlled body motion back to the rear of your car with the KYB Excel-G Suspension Shock Absorber 3440061, a nitrogen gas-charged, twin-tube gas shock. It installs as a direct-fit rear replacement for the 2015-2019 Hyundai Sonata, 2017-2020 Kia Cadenza, and 2016-2020 Kia Optima. KYB builds the Excel-G on the same OE assembly lines it supplies to new-vehicle manufacturers, calibrating it to restore the vehicle's original designed performance rather than change it — earning the OEA (Original Equipment for the Aftermarket) classification.
- Nitrogen gas-charged twin-tube design: includes the same quality components found in KYB's global OEM products.
- Triple lip fluid seal: helps reduce the chance of oil and gas leaking out.
- Vehicle-specific damping valves: hand assembled in-house to manage tire contact, steering response, and body movement.
- Supports electronic safety systems: designed to help keep them performing as the vehicle manufacturer intended.
If worn rear shocks are causing excess bouncing, poor ride control, or reduced stability, this KYB Excel-G unit is intended to restore the designed control and handling of your Hyundai Sonata or Kia Optima. Shocks work as a matched pair — replacing both rear units together is recommended for balanced ride control; sold individually, this listing is for one.
Interchange: 55310C2100 · 55310C2110 · 55310C2510 · 55310C2520 · 55310D5100 · 55310D5120 · 5551
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What vehicles does this KYB shock fit?
It's a direct-fit rear replacement for the 2015-2019 Hyundai Sonata, 2017-2020 Kia Cadenza, and 2016-2020 Kia Optima. See the Buyer's Guide tab to confirm your exact vehicle.
Is this a front or rear shock?
This is a rear suspension shock absorber for the listed applications.
What type of shock is the KYB Excel-G?
It's a nitrogen gas-charged, twin-tube gas shock built on KYB's OE assembly lines, calibrated to restore the vehicle's original designed performance.
How many shocks do I need?
This listing is for one shock. Shocks work as a matched pair, so replacing both rear units together is recommended for balanced ride control.
What are signs my rear shocks need replacing?
Excess bouncing, poor ride control, reduced stability, or oil leakage may be signs the shocks need replacing. Diagnose the cause before replacing.
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