6BT5.9: A 5.9-liter, six-cylinder engine that is turbocharged and aftercooled. It has a power output ranging from 110-160 horsepower (82-119 kilowatts) and a torque output ranging from 305-440 lb-ft (414-597 Nm).
6BTA5.9: A 5.9-liter, six-cylinder engine that is turbocharged and aftercooled. It has a power output ranging from 150-210 horsepower (112-157 kilowatts) and a torque output ranging from 400-600 lb-ft (542-813 Nm).
6BTAA5.9: A high-performance version of the 6BTA5.9. It has a power output ranging from 230-370 horsepower (172-276 kilowatts) and a torque output ranging from 625-1150 lb-ft (847-1559 Nm).
6D102: An 8.27-liter, six-cylinder engine that is turbocharged and aftercooled. It has a power output ranging from 155-240 horsepower (116-179 kilowatts) and a torque output ranging from 554-687 lb-ft (750-931 Nm).