For torqueflite 727 and 9XX transmisions, Chrysler changed recommendations as fluid improved.
About 2/3 way down in this
2002 Motor Magazine article they summarize the differences in ATF up to 2002.
Type F has the opposite characteristics than most of the other fluids. Many racers have used it in torqueflites for that reason.
My conclusions that the 'best' claims to backword compatible ATF for a plain 'A' or 'Dexron' spec'd torqueflite are:
Dexron VI (synthetic and generally most expensive)
Synthetic Dexron spec'd as Dex III replacement
Dexron/Mercon (least expensive)
Multi-purpose (usually least expensive, but IMO these are a crap shoot on compatibility)
The newer ATFs usually have better oxidation resistance and low temperature viscosity. Whatever you buy, check the can (uh bottle) or the manufacturer that its compatible with Dex II or earlier.
Warning: Some bottles say compatible with all Chrysler transmissions. This is a bad sign. The needs of all Chrysler transmissions are not the same. Many do not take Dex III and earlier. There are long articles on this (go to Allpar.com for an example). As stated by others, the big change in Chrysler ATF seems to be when ATF+3 and +4 were developed specificly for the new transmissions with control modules.
Another moparts thread on Dexron and Type F characteristics In it, an oil dealer posts some of the viscosity specs for Dex VI, Dex III, and F synthetics in his product line. Note that this specs, especially for Dex III and Type F may not be the same as other brands, but it is a good way to see one way these ATFs are different.
edit corrected link 
dumb luck or ?????? 
My guess is that Chrysler just decided not to roll the dice on their dime.