Why are you changing the transmission fluid? Assuming this is for an automatic, the manual says that unless the car is used under extremely strenuous conditions, the transmission fluid does not need to be changed as long as the level is good.
Also, having looked into this, a lot of people say that they run into issues after changing transmission fluid. Issues like the check engine light coming on or the shifting being rough.
This is not good maintenance practice. Especially considering Toyota is often vague and inconsistent on requirements for the same car and years. Toyota has also been burned for their maintenance recommendations before, causing the sludge debacle of the early 2000s by recommending 7500 mile oil changes when shops were using cheap dino bulk oil.
Depending on the year Toyota had either a 40K mile service interval, 60K mile interval, or the "lifetime" interval, even though the transmissions are all the same internally and use the same exact T-IV non-synthethic fluid.
Toyota also says to change always at 60K or less, if the vehicle is under "special conditions." What are special conditions? Well depending on the year or region, that may driving in dirty or dusty areas, heavy traffic, towing, driving more than 70MPH for 2 hours, driving above 2600 feet above sea level, driving in stop and go traffic, driving in heavy traffic, etc.
Also the post transmission fluid change issues are a myth. I've done original transmission fluid changes on Toyotas with over 200K miles and many with well over 100K miles with no issues whatsoever. I've changed it on older transmissions and newer transmissions. There are also numerous documented T-IV filled transmission failures on similar vintage Camry models, all which had no fluid replacement.
Also I have seen zero reports here of transmission fluid changed issues, however there have been numerous fixes just from changing the fluid. Specific to these cars, transmission fluid changes have been documented to fix P0741 codes and severe shift concerns. I have also personally seen the shift quality increase in all Toyota transmission fluid types from Dexron/T-III to WS (synthetic fluid).
The single only reason for "lifetime" fluid intervals is to portray vehicle ownership costs as low to aid in marketing. Transmission fluid drives, cools, and lubricates the transmission. The idea that a non synthetic fluid will last a lifetime is just not true. A UOA will clearly demonstrate the fluid breaks down, shears, burns, and loses effectiveness. Some fluids are better, but none are lifetime.
Toyota also does not have any internals for brake fluid, power steering fluid, transmission filters, or PCV valves even though they often fail or cause issues. They also believe for some reason that coolant has a dual interval of 100K and 50K thereafter (2005-2008) or 60K and 30K thereafter (2003-2004) even if you use their coolant.
ATF breaks down and needs to be changed. Toyota maintenance recommendations and intervals are often vague, inconsistent, and nonsensical.