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Automatic Gearbox

 
     
 

Late Classics, P38a and L322 Range Rovers are fitted with four speed ZF automatic gearboxes.

In the Classic, the gear change is controlled only by the pressures in the various channels of the valve chest.

In the P38a and the L322 an ECU controls the gear change via the oil pressures within the valve chest.


These pictures show what's inside a ZF automatic gearbox.

Before you dismantle one of these, consult the proper workshop manual for your vehicle, where you will find important information, including torque settings. This is really a job for an expert with all the tools and a lot of experience.

The torque convertor has an outer casing, an inner impeller and a central stator

The oil feed to the direct drive mechanism is via the central shaft

The inner shaft drives the convertor, which returns drive via the outer concentric shaft

This is what it looks like when assembled

There are a lot of bits inside one of these

The valve chest is in the casing and comprises a very complex network of channels and valves

These diagrams from a 1970 Mini  autobox are similar in principle and much easier to understand

This diagram shows how the gearbox works