Type "F" transmission fluid was for the old Ford C-4 style transmissions with friction bands in them. Note: That the "F" stands for FORD. Or FRICTION if you will?

The big fords had a C-6 style transmission that used Mercon which is the same oil as GM's Dexron. All later Fords with the 4 speed and computer controlled transmissions used the Mercon/Dexron oil.

It is difficult to find type "F" ATF anymore.

Most all ATF at the store is Mercon-Dexron.

Do something else with your type "F". Don't use it in your model engines. You probably havn't hurt anything yet.

Enjoy,

Jim