Hello all! Hope you are doing well. I drive a 2004 Toyota Highlander 4cyl with ~183k miles on her now. I have done 2 transmission drain and refills in the past, relatively close to each other in order to get all the old fluid out when I got the car. They were done with Valvoline Maxlife ATF + Lucas Stop Slip and Castrol High Mileage ATF + Lucas Stop Slip respectively. The transmission is still having some delay going into gears, and I think the transmission filter may be a problem as it has NEVER been changed. Am I on track with this? I was thinking about doing a service soon, draining the pan, dropping the pan entirely and cleaning it, tightening any bolts on the transmission valve body, replacing the filter, reinstalling the pan w/ new gasket, then adding appropriate amounts of Castrol High Mileage ATF + Lucas Stop Slip. Would this help do y'all think? Any fluid and filter recommendations? Also, new drain plug gasket (size?)? Thanks! Have a good day.