Cummins and Eaton have expanded their lineup of integrated ISX15 SmartAdvantage powertrains to provide customers with additional choices tailored to unique applications and operations. A new SmartAdvantage direct-drive ratio is now available, plus new engine ratings for small-step overdrive ratios.

The new direct -rive ratio is available in Cummins ISX15 400- and 450-hp ratings with 1550/1750-lb-ft torque-rating, ensuring optimal performance at lower rpm when combined with a 2.26 or 2.28 axle ratio. This package is meant for linehaul or regional applications that operate in flat and hilly road terrains at cruise speeds in the 50 to 62 mph range.

Launched in 2013, the SmartAdvantage powertrain with small-step technology is now available with new 400- and 420-hp ratings, providing c options beyond the original 450 rating. Small-step technology provides the benefits of both a direct-drive and an overdrive transmission configuration and is ideal where cruising speeds exceed 62 mph or where vehicles spend a high percentage of time (75% or more) at a set cruise speed.

The new options continue to  leverage the diesel engine’s torque and efficiency with technology that enables downspeeding.

The Eaton Fuller Advantage Series 10-speed transmissions feature a 26% step between 9th and 10th gears to maximize downspeeding in the small-step overdrive model by keeping the engine in its ‘sweet spot’ for maximum fuel economy.

Eaton says its Eaton Fuller Advantage automated transmission features the strategic use of lightweight components and precision lubrication, which reduces churning losses and eliminates the need for a cooler. Optimized shifting is based on grade, vehicle weight, engine torque and throttle position.

The 2015 Cummins ISX15 incorporates several enhancements, including low-end torque available at 1000 rpm and ADEPT, a suite of innovative electronic control features that optimize driver performance and asset protection.