What are the best automatic transmission fluids?

Early automatic transmissions used a simple motor oil as the primary lubricant, but as transmissions systems became more complicated, producing a lot more heat, a specialty lubricant was required.

Type A was followed by ATF offerings from Ford and Chrysler in the ensuing decades.
For a time, these fluids sufficed for most of the domestic automatic transmission market.
Today automotive technicians have ensure the ATF they intend to use meets the specifications of the manufacturer for each vehicle.