The turbocharged, intercooled, dry sleeved in-line 6 cylinder FE6TA Diesel engine is the heart of the UD TRUCK. With 225 horsepower and 492 pound-feet of torque (470 pound-feet when equipped with Allison LCT-Series transmissions), the engine delivers gutsy performance in stop-and-go city routes and during longer range interstate trips. The FE6TA's balanced powertrain also produces excellent startability.

The FE has been a proven performer in the American market for over 14 years. In that time, several advancements, like 24-valve technology, have improved performance and lowered its cost of operation. Combustion efficiency has been increased through an electronically assisted fuel injection system (MD-TICS) and a tuned intake/exhaust system, resulting in optimum fuel economy. The air compressor and power steering pump are gear driven for greater reliability, while a single V-rib poly belt operates the water pump, fan clutch/fan, and alternator.

Because protecting our environment is a top priority for the Nissan Diesel Motor Company, the FE6TA meets all current EPA Emissions Standards and California Air Resource Board Requirements. The 24 valve engine design, along with a high pressure fuel injection system and a Soluble Organic Fraction (SOF) catalytic converter combine to make the FE one of the cleanest commercial truck engines available today.

Harnessing the power of the FE6TA are transmissions specifically designed to optimize the engine's strengths and payload requirements. For manual transmission applications, the U1800HD to UD3300 are equipped with the MLS61B, 6-speed overdrive.  Allison automatic transmissions are available in the UD1800HD to UD2600. The LCT1000 automatic is optional in the UD1800HD  and the UD2000. The LCT2400P automatic is optional in the UD2300LP, UD2300DH and the UD2600.