The original "Type A- - -Suffix A" fluid used in the HydraMatic stopped being made back in the mid-1960's. The problem was that it used a small percentage of whale oil in its formula, and the bunny huggers raised so much stink about whaling that a synthetic fluid had to be developed. Type F fluid has a lot of very aggressive friction enhancers designed to work with the hard black clutch material used by the Ford FMX type transmissions, and it's death on GM clutch material. Dexron is the closest match to the old Type A, but it's not perfect.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!