Listed gear-ratio data for 2006 Tohatsu 40 HP outboards. Match your exact model and lower unit; some models may have more than one gearcase configuration.
2006 Tohatsu 40 HP
Listed ratio values: 1.85:1
| Model | Gear ratio |
|---|---|
| M40D2 | 1.85:1 |
| MD40B | 1.85:1 |
Use the ratio that matches your exact outboard model and lower unit, then enter it in the PropSlip calculator.