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Subaru 4EAT Transmissions End W rench Th e 4 Subaru 4EAT Transmissions Overview Features and Major Components Power Flow Final Drive FWD/AWD Electronic Control System Hydraulic Control System Self Diagnostic System Troubleshooting/Adjustments Page 2 he 4EAT Transmission is a 4 speed, microprocessor-controlled transmission that was first introduced in 1987.5 Subaru models. It is not a 3 speed trans- mission with overdrive. It features a lock-up torque converter which locks up in all forward gears except 1st. It has been offered in FWD or Full Time AWD configurations. The 4EAT transmission has undergone continuous development and improvement since its introduction. Several unique 4EAT features have been added, changed, or deleted from various Subaru models over the years. We’ll provide you with a brief overview of these features here. For a more thorough description of specific 4EAT operating characteristics or features, refer to the applicable Subaru service manual for the year and model Subaru you are working on