727 transmission fluid

ATF +4 is fine for 727/904.

You can ask many different transmission builders what fluid to use and you’ll get different answers. But to say atf +4 shouldn’t be used because it’s “too slippery” is false. That’s like saying type f is for fords and shouldnt be used in a 727 or other transmissions. You could run pure hydraulic fluid in your 727 and it will be fine. Guys will mix Dex III with type f and put them in their 727s.

Most don’t want to spend the extra money on +4 because it’s a synthetic fluid, which is not a necessity on a 727. However, if you are running the car on the street and it sees pretty high trans temperatures, the synthetic fluid can help with that.

Regardless, the ATF +4 is fine for a 727/904.