727 Trans fluid question

[Loulang]

I am changing the filter in my 727 trans but I’m not sure what kind of trans fluid is in it and a lot of posts say to use type F trans fluid my question is what if that’s not the fluid that’s in it already will it hurt my transmission to put type F in?

 

[zyzzyx]

ATF+4 should work just fine. It's Mopars synthetic fluid.

 

[RemCharger]

I always stick with regular atf. +4 is the synthetic version. You're on your own with the type F conversion. Some people use it regardless and haven't shown any I'll effects. It lacks some friction modifiers.
My own testing involves a trans I built 20 years ago and has proven 9 track championships and still in the car today.

Edit I ran type F the first year and **** went down so I stopped that.

Don't search this topic you're head will explode

 

[Loulang]

I always stick with regular atf. +4 is the synthetic version. You're on your own with the type F conversion. Some people use it regardless and haven't shown any I'll effects. It lacks some friction modifiers.
My own testing involves a trans I built 20 years ago and has proven 9 track championships and still in the car today.

Edit I ran type F the first year and **** went down so I stopped that.

Don't search this topic you're head will explode

I think I’m gonna go with the atf+4 I hate not knowing what’s in it. I got no info other than motor and trans was rebuilt and you can tell that’s why I bought my 66

 

[Geoff 2]

Stick with what Mopar recommends. They would have tried Type F and......

 

[RemCharger]

Stick with what Mopar recommends. They would have tried Type F and......

They did and promoted it at the performance clinics. A short term performance enhancer .
Transmissions were cheap back then.