from cars.com:


drivetrain

    All components that generate power and propel a vehicle

    The drivetrain, sometimes called the powertrain, includes every component in the chain from the
    engine to the drive wheels. The drivetrain’s three main segments are the engine, the
    transmission and the driveline. 


driveline

    The parts of the drivetrain excluding the engine and transmission

    Where the drivetrain includes everything in the chain from the engine to the drive wheels, the
    driveline consists of everything after the transmission — all driveshafts, axles, joints,
    differentials and wheels.

    Two-wheel drive, four-wheel drive and all-wheel drive are different kinds of drivelines.




Also note that "powertrain warranties" are common