Listed gear-ratio data for 2013 Nissan 9.9 HP outboards. Match your exact model and lower unit; some models may have more than one gearcase configuration.
2013 Nissan 9.9 HP
Listed ratio values: 1.85:1, 2.15:1
| Model | Gear ratio |
|---|---|
| NS9.9D2 | 1.85:1 |
| NSF9.9C | 2.15:1 |
Use the ratio that matches your exact outboard model and lower unit, then enter it in the PropSlip calculator.