Overview
The 4EAT transmission is a 4-speed, microprocessor-controlled transmission introduced in 1987.5 Subaru models.
It features a lock-up torque converter and has been offered in FWD or Full Time AWD configurations.
Key Features
The transmission has undergone continuous development and improvement since its introduction.
Some models were equipped with a 1-HOLD button, which activates manual gear selection.
The POWER mode is selected by the computer based on how quickly the gas pedal is depressed, changing the performance characteristics of the transmission.
Electronic Control System
The Transmission Control Unit (TCU) monitors various engine and vehicle inputs and controls the electronic shift solenoids in the transmission.
The TCU also has a self-diagnostic long-term memory and a fail-safe function.
Manual:
Download: Subaru 4EAT Transmission Service Manual
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