Originally Posted by late_99_PSD
Do they have any syncros in them? If so I definatly would run what Ford tells you to. In a transmission at least, running anything but what they recomend will screw with the whole thing. I switched to synthetic ATF in my trans
Shifted like crap. switched back to dino ATF, shifted like a champ
Ford doesn't design or mfgr the transfer cases. New Process / New Venture Gear does. It is safe to run ATF in most all modern transfer cases. This is the same for Ford, Dodge, GM, etc.
As for the trans, yes, run only what Ford tells you to.