1996 Ford Ranger Owner's Manual - Page 299

It is preferable to check the transmission fluid level at normal operating temperature, after approximately 20 miles (30 km) of driving. However, if necessary, you can check the fluid level without having to drive 20 miles to obtain a normal operating temperature if outside temperatures are above 50˚F (10˚C). NOTE: If the vehicle has been operated for an extended period at high speeds or in city traffic during hot weather, or pulling a trailer, the vehicle should be turned off for about 30 minutes to allow the fluid to cool before checking. Checking the Automatic Transmission Fluid With the vehicle on a level surface, start the engine and move the transmission shift selector through all of the gear ranges allowing sufficient time for each position to engage. Securely latch the transmission shift selector in the P (Park) position, fully set the parking brake and leave the engine running. NOTE: Vehicles equipped with the 4x4 option must have the 4x4 shift selector in any position other than neutral. If in neutral the vehicle may move. RWARNING Your vehicle should not be driven if the fluid level is below the bottom hole on the dipstick and outside temperatures are above 50˚F (10˚C). Wipe off the dipstick cap (located on the passenger's side of the engine), pull the dipstick out and wipe the indicator end clean. Put the dipstick back into the filler tube and make sure it is fully seated. Pull the dipstick out and read the fluid level. 300