Rocket Fuel

The SmartAdvantage Powertrain

Whether you run coast-to-coast with up to 80,000 lb. Gross Vehicle Weight (GVW) or stay close to home and make multiple stops on every route, there’s a SmartAdvantage Powertrain that can help you reduce fuel use and lower your total cost of operation while maintaining road speeds and driver satisfaction.

The key is to spec the right SmartAdvantage Powertrain at the ideal horsepower and torque rating with the proper Eaton Fuller Advantage 10-speed automated transmission, utilizing the correct axle ratio and tire size to deliver the optimum in driver-pleasing performance with the best possible fuel economy.

The SmartAdvantage Powertrain can be customized just for you. A variety of different categories, axle ratios and ratings are available to provide the best setup for your individual use.

Our SmartAdvantage Selection Guide makes this process quick and simple. Just answer six questions and you’ll receive the SmartAdvantage Powertrain specs that will help you achieve maximum fuel economy. Your ideal spec can then easily be shared to streamline the spec’ing process as much as possible.

Transmission Top Gear Cummins Engine Power hp (kW) Peak Torque lb-ft (N•m) @ rpm Eaton Transmission Model Axle Ratios
Small-Step Overdrive ISX15 400 SA 400 (298) 1450/1650 (1968/2240) @ 1000 FAOM-14810S-EC3 2.64
ISX15 400 SA 400 (298) 1550/1750 (2103/2375) @ 1000 FAOM-15810S-EC3
ISX15 420 SA 420 (313)
ISX15 450 SA 450 (336)
ISX15 400 SA 400 (298) 1550/1850 (2103/2508) @ 1000 FAOM-18810S-EC3
ISX15 450 SA 450 (336)
ISX15 475 SA 475 (354)
Direct Drive ISX15 400 SA 400 (298) 1550/1750 (2103/2375) @ 1000 FAM-15810B-EA3 2.26
ISX15 450 SA 450 (336)

Fleets operating vehicles in excess of 80,000 lb. GVW will achieve the desired balance of performance and fuel economy using the combination of an ISX15 475 together with the Eaton UltraShift® PLUS LSE 16-speed automated transmission. For details, please see Eaton Heavy-Duty Transmissions or

To make sure you get the most out of every gallon of fuel, consult your local Cummins distributor. Cummins technical experts will ensure you get the best engine and drivetrain combination to match your exact vehicle and application needs.

Cummins PowerSpec online spec'ing tool and Vehicle Mission Analysis (VMS) allow us to analyze your specification for the best combination of performance and fuel economy. Cummins PowerSpec can also help you identify the correct axle ratio, gearing recommendations and specifications for the equipment you run as well as set programmable features on the ISX15 and ISX12. For more details visit