ZF 4 HP-22 Automatic Transmission

For its time this transmission was very advanced. It was a four-speed automatic transmission in an era when this was highly unusual.

It also has a lock-up torque converter. This feature means that, at 60 mph or so, the automatic transmission starts to behave like a stick-shift transmission. This helps power and fuel economy, both.

This transmission is light yet very strong. It is also very durable. It has a long life-time especially when serviced fairly regularly. Fortunately, it has several design features that make it easy to service.

BMW didn’t make this transmission; it was made by arguably the world`s leading manufacturer of automatic transmissions, a German company named ZF.

This transmission was used in the flagship models of elite automakers such as Alfa Romeo, BMW, Jaguar, Land Rover, Maserati, Peugeot and Volvo.


The EH variant of this transmission has some special electronics that enabled the car to have an economy mode or a sport mode. A knob by the gearshift lever enables the driver to change the car’s personality from docile to fire-breathing.