Wow, my brain is bent from trying to wrap it around all the transmission fluid threads and methods I've read the past week.
To confirm, so for my 2006 LX470, which has the 5sp AT "sealed" (no dipstick) transmission, for a "full fluid transfer":
No need to drop pan and/or replace screen.
1. drain in to bucket, preferably w/qt graduations, by using a bypass hose at ATF connection at radiator.
2. drain 3 qt at a time, then refill 3 qt at a time at refill plug hole on AT, turning the truck on at drain, and off at fill, each time.
3. repeat until clean fluid comes out.
4. ensure AT temp is 97-115, then follow bleed-off procedure in Post #160 to ensure not overfilled ("Procedure is to shift through all gears once at temp. Once at temp, while idling with shifter in "N", remove check plug. If overfilled, ATF fluid will run out. If underfilled it will not run out. You want it slightly overfilled and let run out until it just drips. DONE.")
Then done?
How long does this process take, assuming you have all the parts (ATF fluid and refill plug washer at final refill) and tools/bucket/hose.
How many quarts ATF should I expect to need, 15?
Begin the process with engine/AT cold? Warm?
I assume no problem doing this with AHC at High for access underneath.
If I understand corrrectly there's no drain plug on this "sealed" AT, just a refill plug?
My mechanic was talking about doing a 3-4 qt "drain and refill" (I'd rather have all new fluid, preferably) , or dropping the pan (still doesn't get all the fluid, and more can go wrong IMO) so just want to be sure I understand in case I decide to DIY.