Ford 1999 Ranger Owner's Manual page 216

Filling station information
Item
Automatic transmission fluid
capacity-4x2 vehicles with 2.5L
2
I4 engine
Automatic transmission fluid
capacity-4x2 vehicles with 3.0L
or 4.0L V6 engine
Automatic transmission fluid
capacity-4x4 vehicles
1
If your engine coolant is green in color, use Ford Premium Cooling
System Fluid. If your engine coolant is orange in color, use Ford
Extended Life Engine Coolant. Refer to Adding engine coolant, in the
Maintenance and Care chapter.
2
Ensure correct automatic transmission fluid is used for a specific
application. Check the container to verify the fluid is MERCON and/or
MERCON V approved. Some fluids have been approved as meeting both
MERCON and MERCON V requirements and will be labeled as such.
Fluids labeled as meeting only MERCON or only MERCON V
requirements must not be used interchangeably. DO NOT mix MERCON
and MERCON V. Transmission fluid requirements are indicated on the
dipstick or on the dipstick handle. Refer to your "Service Guide" to
determine the correct service interval.
216
2
2
Information
9.3L (9.8 quarts). Use Motorcraft
MERCON V ATF.
9.5L (10.0 quarts). Use Motorcraft
MERCON V ATF.
9.8L (10.3 quarts). Use Motorcraft
MERCON V ATF.