Ratio Calculator

Welcome to our exclusive Rear Differential Ratio Calculator! This tool is designed to help you determine the ideal differential ratio to use in American Truck Simulator, perfectly complementing our upcoming Eaton Transmission Mod.

Begin by typing in the Terminal window below and responding to the prompts to get your result. You'll need to have the following information ready (this information can be obtained in the Garage, we recommended you use a wheel/tire mod such as Jaspers that uses realistic data and where you can see the info written on the tires): tire width, tire aspect ratio, rim diameter, transmission speed, and engine torque.

Designed with Eaton Transmission Data, it will not provide realistic results for other transmissions.

Operation Type Logic

Over-the-Road (OTR):

• Typically involves long-distance driving on highways.
• Prioritizes fuel efficiency and consistent cruising speeds.
• Might use lower numerical axle ratios to reduce engine RPM at highway speeds.

Regional:

• Involves medium-distance trips, often with frequent stops.
• Requires a balance between fuel efficiency and the ability to handle varied driving conditions.
• Might use moderate numerical axle ratios for versatility.

Heavy Haul/Oversize:

• Involves transporting heavy or oversized loads.
• Prioritizes torque and power to handle heavy loads and challenging terrain.
• Might use higher numerical axle ratios to provide more torque.