1999 Ford Mustang Owner Guide 1st Printing - Page 148

Maintenance and care could result when the vehicle reaches normal operating temperature. The transmission fluid should be in this range if at normal operating temperature (66°C-77°C [150°F-170°F]). The transmission fluid should be in this range if at ambient temperature (10°C-35°C [50°F-95°F]). High fluid level Fluid levels above the safe range may result in transmission failure. An overfill condition of transmission fluid may cause shift and/or engagement concerns and/or possible damage. High fluid levels can be caused by an overheating condition. Adjusting automatic transmission fluid levels Before adding any fluid, make sure the correct type is used. The type of fluid used is normally indicated on the dipstick and/or dipstick handle and also in the Lubricant specifications section in the Capacities and specifications chapter. Use of a non-approved automatic transmission fluid may cause internal transmission component damage. If necessary, add fluid in 250 mL (1/2 pint) increments through the filler tube until the level is correct. If an overfill occurs, excess fluid should be removed by a qualified technician. 148