When used in combination with the Cummins and Eaton SmartAdvantage Powertrain, the new axle ratios will improve fuel efficiency for linehaul applications through “downspeeding,” a process that maintains vehicle speed at lower engine rpms.

With these new axle ratios, drivers will experience a fuel-economy sweet spot at road speeds of 62 to 65 mph. The new axle ratios specifically target the needs of fuel efficiency-minded customers and are another example of how we are continually creating and updating our offerings to better-serve the industry.

—Ken Hogan, general manager, Axles, North America for Meritor

The Meritor 14X tandem axle is the successor to the Meritor RT-40-145, and includes a more robust, 20% larger Inter-Axle (IAD) to handle today’s higher-torque engines. It is the lightest-weight axle in its class.

Meritor 14X tandem axle. Click to enlarge.

To maximize fuel economy and vehicle performance, fleets should consider the entire drivetrain, including engine parameters, transmission and rear-axle gearing and tire sizes, according to Hogan. He suggests fleets consult their OEMs, local engine distributors or Meritor representative to review exact vehicle and application needs.