1997 Ford Expedition Owner's Manual - Page 171

Maintenance and care CHECKING AND ADDING TRANSMISSION FLUID Checking and adding automatic transmission fluid (if equipped) Service the automatic transmission according to the scheduled intervals in the Service Guide. Before adding any fluid, make sure the correct type will be used. This information is indicated on the dipstick. • 4R7OW automatic transmissions are used with 4.6 L engine applications. • E4OD automatic transmissions are used with 5.4 L engine applications. Do not drive the vehicle if the fluid level is below the bottom hole on the blade type dipstick (4R70W transmission) or below the COLD area on the bullet type dipstick (E4OD transmission) and outside temperatures are above 10°C (50°F). Your vehicle does not use up transmission fluid. However, it is recommended that you check the transmission fluid at least twice a year. The fluid level should be checked if the transmission is not working properly, i.e., if the transmission slips or shifts slowly or if you notice some sign of fluid leakage. It is preferable to check the transmission fluid level at normal operating temperature, after 172