Powertrain is system which generates and transmits power.

In most cars the powertrain includes:

  • engine
  • clutch
  • gearbox
  • final drive
  • differential
  • driveshafts
  • wheels & tyres

The powertrain may also include:

  • torque converter (if an automatic transmission is fitted)
  • propellor shaft (for rear-drive or four-wheel drive vehicles)
  • transfer box (for four-wheel drive vehicles, as shown above)

Powertrain is sometimes taken to mean the engine/gearbox assembly only.

See also: drivetrain