Quote:
Originally Posted by Schurkey
Do keep in mind that ATF has "evolved" over the years, it's getting thinner (lower viscosity) and it has increasing amounts of friction modifier to condition the wet clutches and bands in an automatic transmission, As it becomes more specialized for AT use, it may have become less suitable for PS use.
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X2. I couldn't keep Dexron in the PS reservoir very long in my '59 after I brought it back from a 25 year nap. It got low again and I had a bunch of Type FA left over from changing the trans fluid on the 4 speed hydro, so I evacuated the Dexron and substituted Type FA. It never did leak a drop after that, and top of that, low speed performance ('59 389's idle at 480 RPM's) substantially increased.