Drivetrain of a vehicle is the group of those systems that are responsible for the transfer of power to the driving wheels. This however excludes the engine or motor that generates the power. It couples the Engine to the driving wheels that use this mechanical power to rotate the axle. The components of drivetrain is slightly different in both the mechanical transmission vehicles and Automatic transmission vehicles. Manual Transmission vehicles contain Flywheel, Gearbox, Clutch , Propeller shaft , rear axle however in a Automatic transmission vehicle.