What is a drivetrain?

Answer 1

The drivetrain or powertrain is composed of all the units joined together in a vehicle to make it move. We usually speak in terms of the engine and drive train, so it's everything from the engine "back" or "out" depending on the car. From the front you have the flywheel on the rear of the engine, then clutch, then transmission, then driveshaft, then differential then axles to the wheels. That's a manual transmission. If you have an automatic, you won't have a flywheel or clutch. In their place would be a flex plate and torque converter. On front wheel drive cars, they sometimes have a transaxle, which is combination transmission and differential. Out from there are the axles to the wheels. These are sometimes called constant velocity joints.