QSK78 G-Drive engine provides the optimal combination of productivity and performance. Its 4060-horsepower (3028 kWm) V18 configuration incorporates the best features of our QSK Series engines, including advanced combustion technology and robust base engine components.

The Cummins® 6LTAA9.5 engines takes diesel midrange engine technology to a whole new level of power density and versatility. It features a 24-valve and bigger flow injector design for one of the highest power-to-weight ratio in its class. The engine has a standard electronic governor control system to keep engine speed more stable and for fast transient response. At the same time, the 6LTAA9.5 engine delivers better fuel economy and less smoke emissions than others in its class. 

HD pickup buyers can get an impressive 1,075 lb-ft of torque. This high-output (HO) rating is offered exclusively in the RAM 3500 equipped with the Aisin transmission option. The new high-output engine boasts 420 hp and 1,075 lb-ft of best-in-class torque. For RAM 2500 and 3500 (equipped with a 68RFE Auto) HP and torque have increased to 370 hp and 850 lb-ft to provide the right power for these models.

In 2019, RAM 3500, 4500 and 5500 Chassis Cab models equipped with a Aisin automatic, see an increase in horsepower and torque to 360 hp and 800 lb-ft. In addition to moving to a higher capability high pressure pump, several critical features were included to maintain the proven reliability and durability our customers have come to expect:

Proven Performance. Every Call. ISC8.3 for EPA 2010.

600 lbs Lighter in 2018? The Weight is Worth It. At 2050 lbs, the X12 is especially designed for weight-sensitive applications. Up to 600 lbs lighter than other medium-bore engines and 150 lbs lighter than the next lightest engine in its class. What can you carry with 600 more lbs?