Thanks everybody! The problem is
My tundra does not have a dipstick. It is a very big deal with this Toyota transmission to get the fluid level perfect. In my mind, the logical thing is to replace it 4 quarts at a time through the cooler lines, or, do a drain and fill when it is ice cold, drive it for the day, and then repeat the next morning when it is ice cold again. That way, four quarts at ambient temperature taken out is replaced with 4 quarts at ambient temperature put back in. This is a good start to making sure the level is correct. Technically Toyotas scan tool is required, but there is some hack where you can use the odometer with some pins pushed in the OBT to port
I have access to the scan tool