Automatic transmissions are becoming more complex every year. Once controlled by vacuum, modern transmissions have been transformed into computer command centers made up of various solenoids and other electronic gadgetry that control the operation of the transmission. New technology brings changes to transmission filter service maintenance.
Some manufacturers require literally no scheduled maintenance.
Several auto manufacturers have no scheduled maintenance until the vehicle has 100,000 miles on the drive train. Non serviceable transmission filters were introduced in the 70s. Almost every manufacturer now has a transmission that is non serviceable. Caution and care must always be taken when replacing any transmission filter. The non serviceable ones require extreme scrutiny.