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type f is one of the grippiest trans fluids out there. The c6 will be fine run on just about anything but water. Id personally if it were mine fill it with chevron thf1000 tractor transmission fluid.
Ive done quite abit of testing fluuds in my auto in my cummins pickup
Fordf dex's atf4. I do run the thf1000 in it. Change it about ever10k crisper shifts and temp gauge shows less heat wich means its slipping less with thf1000. Spec is atf+4
I run chevron 15/40 in everything with a crank case. My 76 has it with zinc additive
And bottle that says brake fluid works
80/90 gear oil in the difs. The 1000 in diffs when in a pinch.
Reading your owner's manual will tell you what Ford recommended in 1977. Specifications may have changed on some of the fluids, but it's at least a start.
It's better to keep the moisture out of the system by repelling it than to absorb it.
It would be better, all things being equal.
The problem of course, and this is why alcohol based brake fluids were selected in the first place, is that older brake systems are not sealed to the atmosphere, as they are now, they weren't a closed system. Moisture, in the form of condensation due to temperature swings inevitably gets in.
It just sort of bugs me when brake fluid discussions always revolve around "it absorbs moisture!!!" as if this is some kind of defect and the engineers were idiots. Not pointing fingers at you or anyone, just that this characteristic is a feature not a bug.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
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