FORD 2000 Mustang - Manual (Page 224)

3 Service refill capacity is determined by filling the transmission to the
bottom of the filler hole with the vehicle on a level surface.
4 Indicates only approximate dry-fill capacity. Some applications may
vary based on cooler size and if equipped with in-tank cooler. The
amount of transmission fluid and fluid level should be set by the
indication on the dipstick’s normal operating range.
Filling station information
224