Glossary: Final Drive Ratio
**Final Drive Ratio** is the final gear reduction stage in a vehicle's drivetrain, typically located within the differential, which multiplies the transmission's gear ratios to determine engine RPM vs vehicle speed.
Transmission Sizing and RPM Chart
Final drive ratios dictate overall fuel economy and engine torque curves. Off-roaders specify higher final drive gears (steeper ratios) to crawl steep paths, while commuter cars use lower final drives for highway efficiency.