Hello all! I drive a 2004 Toyota Highlander FWD 4 Cylinder with now 183k on her. Currently I am facing a problem of the transmission sometimes hesitating to go into it's last gear, 4th I believe. This will happen usually in the morning on the first drive of the day to school or work but it also occurs other times, seemingly at random. My ATF is normal looking, all pink/red, no metallic specks etc. and has been drained and refilled as service, twice as far as I know (I am the third owner, was gifted the car from my mother and father before her). However, I know the transmission filter was NEVER replaced. Could a transmission dump, fill, and filter replacement possibly solve my problem? Also maybe some stop slip additive like the Lucasoil stuff? Please let me know anything that I could do to help. Thanks! Have a great day.