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So, anything other than "A" isn't going to duplicate "A". It would be interesting to hear from Howard which ATF comes closest to matching the slip/friction characteristics of "A".
I don't think I can add anything to the discussion. Brian pretty well covered the known information in his FAQ article. I do remember a recent post saying type A was really a form of hydraulic or other light oil with some added modifiers. That was surprising and don't remember hearing that before. I had always been under the impression A contained some whale oil and that was the main reason it went away.
Type F was the recommended replacement by many of the active Packard people in both clubs as far back as the 70's. It was supposed to be the closest to A according to those that made the recommendation and wrote the articles. I don't recall ever seeing any proof of that. In comparison to the GM product available at the time F was much firmer. The theory was that the quick grab of F was more beneficial to the original cork components since the longer slippage of the other would cause clutches to overheat and burn more readily.
Now that F seems to be heading to the same fate as A, various modern forms of Dexron will be the only thing easily available anyway. Your recommendation to try one and if not satisfied with the feel change to another makes as good a sense as anything else.
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