OK here we go. The drive train is the transmission. You can change the engine without taking out the transmission just make sure to support it with a jack underneath. Your does not have a flywheel but it does have a flexplate that connects to the torque convertor. You will need to get under the car remove the dust cover from the transmission and unbolt the four bolts that hold the torque convertor to the flexplate. After that you need to remove all the bolts from the bell housing and you should be able to lift the engine out of the car. Make sure to support the engine with the hoist before you attempt to unbolt the transmission because they support one another.
Make sure you get all the bolts out of the tranny to make sure that the transmission doesn't catch and hold the engine. When you attempt to remove the engine make sure that you lift it gradually so you can move it around as needed.