Cummins, Eaton add downsped overdrive model to SmartAdvantage powertrain offering

Cummins EatonA new downsped overdrive model is being added to the Eaton and Cummins SmartAdvantage powertrains, with a 1,550/1,850 lb.-ft. torque rating compatible with rear axle ratings down to 2.47:1.

The taller ratio enables engine cruise speeds as low as 1,075 RPMs – lower than some direct drive transmissions.

Alex Stucky, product strategy manager of Heavy-Duty Linehaul Transmissions for Eaton Cummins Automated Transmission Technologies, says the new SmartAdvantage model is capable of the lowest cruise RPMs in the trucking industry for best in class downspeeding.

“It’s our most downsped SmartAdvantage Powertrain,” he says, adding it has been validated in field tests across a wide range of duty cycles.  “When paired with the 1850 rating, fleets can maximize fuel economy without sacrificing performance.”

Eaton says fleets running 2010 model year trucks can expect to see 20 percent better fuel economy with the current X15 SmartAdvantage Powertrain versus the 2010 ISX15 powertrain.

Available through North American OEMs in October, the new unit combines Cummins’ X15 engine and Fuller Advantage Series automated 10-speed transmissions with a choice of small-step overdrive or direct-drive gearing.