Listed gear-ratio data for 2005 Johnson 9.9 HP outboards. Match your exact model and lower unit; some models may have more than one gearcase configuration.
2005 Johnson 9.9 HP
Listed ratio values: 2.08:1, 2.42:1
| Model | Gear ratio |
|---|---|
| 9.9 HP Johnson 2-Stroke | 2.42:1 |
| J9.9 4-Stroke (Suzuki-built) | 2.08:1 |
Use the ratio that matches your exact outboard model and lower unit, then enter it in the PropSlip calculator.