Transmission fluid question

I have a 2001 Tacoma 2wd base model with the small 4cyl engine & auto transmission (A4D). I want to change the transmission fluid to synthetic. My question is: How much new fluid will I need to complete a fluid flush in order to get all of the old fluid out? Owner’s manual says transmission fluid capacity is 2.5 qts. Does anyone know if that’s just the transmission pan capacity or the entire system? I imagine that the cooler, lines, & torque converter hold much more than that! My guess is that I will need about 12 qts? Any input will be greatly appreciated!

 

Definitely not 2.5, that might be the pan. I would venture to say 8-12 qts but I don't have the answer you're looking for.

 

More than that to do a flush; old fluid will remain just the same way it does when you flush your coolant out.

Might be more than several cycles of drain and fill as well as some added driving.

I would stick with Toyota's ATF. It works well.

 

My neighbor’s son is an engineer for NASA. He was involved with developing a new line of motor & gear oils, as well as transmission fluids. From what I understand, these are full synthetic with ceramic. I’m running the engine oil in my 2018 F-150 EcoBoost, with 86k miles. I’m trying out the oil & transmission fluid in my 2001 Tacoma. We’ll see how it goes. I’m very happy with my F-150 stats. I’ll post some results later.

 

Any updates?

 

Don't do a flush. Especially at higher mileage. It just breaks loose stuff that you dont want moving around to cause a failure.

Only ever drain and fill.