According to my Haynes repair manual :
For a 1994 Ford Explorer A4LD automatic transmission :
( MERCON automatic Transmission Fluid is used )
DOT ( 3 ) brake fluid
75w90 gear oil
75w140 synthetic
mercon auto transmission fluid
On a 1991 Ford Explorer : The A4LD automatic transmission uses MERCON automatic transmission fluid according to my Haynes Ford Explorer repair manual * the type of fluid used should be engraved into the automatic transmission fluid level dipstick
DOT ( 3 ) brake fluid is used for the hydraulic clutch and the brakes in a 1997 Ford Explorer Sport
DOT 3 brake fluid ( meeting Ford specification ESA-M6C25-A )
D O T ( 3 ) brake fluid
Remove the transmission dipstick and read what it says on the stick, it will tell you what fluid to use.
mercron 5 atf
Motorcraft MERCON automatic transmission fluid is used in the transfer case
Motorcraft MERCON automatic transmission fluid