Here's a more detailed instruction.
1. find a 1 gallon milk container. measure and mark the 1st qt to 4th qt.
2. drain the pan and remove the pan and clean both pan and filter.
3. measure the atf you drained using the milk container. (need this later when refilling).
4. reinstall the clean filter and pan (use new gasket and torque to specs)
5. disconnect the atf line from top of radiator (driver side) - find out which one is the return line and line from pump.
6. get a hose (clear hose) that will fit inside the hose coming from the pump (seal it with teflon tape, then direct it to the milk jug all the way to the ground.
7. connect another hose to the fitting in the radiator and use it to fill the transmission with oil. (only use the amount of oil that you drained out from step 2) - this may take a bit longer unless you put pressure
8. once refilled, start engine and watch the milk jug until it's filled up to 2 qts and stop the engine.
9. refill it with atf again with another 2 qts and proceed with step 8. continue until a reddish color appear on the hose and don't do step 8 anymore.
10. remove the vinyl tubing and reconnect the hose to the radiator and the clamp.
11. YOU FINALLY FLUSHED YOUR TRANSMISSION. NOW IS THE TIME TO TEST DRIVE IT. :driving:
I have been "flushing" with ONLY the aid of the car's engine the transmission of my cars, e.g. Volvos, Toyotas, VWs, Audis with success for many years. I would perform this task either every 2 years or every ~ 25K miles, especially if you do heavy duty towing or otherwise you stress your transmission and/or have no transmission oil cooler (optional installation.)
Toyota makes quality cars BUT in some areas are completely clueless!! Typically, Toyota hasn't matched the Swedish or others in proper rust-protection. The WS ATF type specified by Toyota has lots of nonsense built into it. It is totally foolish for one to NEVER replace the ATF in the above noted conditions or when a car exceeds 150K miles.
In any event, I wish to add the following in the original post here:
1. Warm-up the engine for 3-5 minutes.
2. Wear proper protective gloves, etc. so the relatively hot ATF does burn you as you would be removing the ATF plug.
3. Remove the ATF plug and remove as much fluid as it would come-out from the car's transmission. If your car has been used either in stress conditions or has more than 150k miles, then drop the transmission pan, clean the filter, pan, drain plug, etc. and re-install with new gasket (possibly a seal as well for the filter.) Torque pan bolts to specified value.
Be CAREFUL:
The values might be in Inches-lbs or Ft-lbs. You may strip or crack your transmission pan IF you mix-up the specified values!!!
4. Re-install the transmission drain plug and torque it to the specified value.
5. Measure the amount of ATF which was removed from the car and add an equal volume of it through the process of the original post or the transmission's fill plug. Do NOT use the expensive WS ATF fluid. Instead use any of the much less expensive alternative ATF fluids that are listed in
https://www.tacomaworld.com/threads...a-ws-atf-automaitc-transmission-fluid.373083/
6. Continue the "flushing" process as it has been documented in the original post here and amended in my post.
7. Drive the car for 200-300 miles or even a bit longer to ensure all the burrs, residue of the previous oil in the transmission has been detached from the internal surfaces of the transmission and it is either dropped at the bottom of the pan or mixed with the non-WS, new ATF fluid.
8. Repeat the above process once more, if you really wish to return your car's transmission in its best possible operational state or simply repeat the above process using Toyota's EXPENSIVE WS ATF fluid.
9. Monitor the performance quality of your car's transmission and perform this task as often but PROPERLY as it might be required.
Good Luck!
Disclaimer:
My post contains ONLY suggestions. You are responsible to read, comprehend what I have written and then take proper action.