So i know this is going to sound really stupid but i put water in my automatic trans TH200 4r CFZ. Not intentionally you can be sure of that but its there (idiot friend of mine added water to my atf jug in the truck and i poured it in the dark). anyway i drove it about 10 miles and noticed it. anyway dropped the pan and cleaned filter then run 10qts of fresh atf through it with cooler line disconnected. still coming out pink but my question is. Is it worth pulling the trans out and draining the torque converter/ flushing trans while out of vehicle ? would the water already damage the transmission only being in there for less than 10 hours and only ran 10 miles ? it isn't slipping yet and still shifts good. would really appreciate some advice and perhaps some relief on if i should start looking for another transmission or not. i added probably a 1/4 qt of water all together.

 

it can be hard to get it all out. at this point, disconnect the trans cooler outlet line and direct the line into a waste container. run the engine until about 3 or 4 liters come out. stop the engine. add 3 or 4 liters of fresh atf and repeat until all the pink fluid is gone. plan on at exchanging 20l of fluid.

 

You can also take it to a transmission shop and have them flush it out and replace all of the fluid. Be prepared to pay.