Listed gear-ratio data for 2017 Mercury 400 HP R Racing L6 outboards. Match your exact model and lower unit; some models may have more than one gearcase configuration.
2017 Mercury 400 HP R Racing L6
Listed ratio values: 1.75:1
| Model | Gear ratio |
|---|---|
| L6-2015-2022 | 1.75:1 |
Use the ratio that matches your exact outboard model and lower unit, then enter it in the PropSlip calculator.