FORD 2013 F-550 v.1 - Manual (Page 310)

Adjusting Automatic Transmission Fluid Levels
Note: Use of a non-approved automatic transmission fluid may cause
internal transmission component damage.
Before adding any fluid, make sure the correct type is used. The type of
fluid used is normally indicated on the dipstick handle and also in the
Capacities and Specifications chapter.
If necessary, add fluid in 1/2 pint (250 ml) increments through the filler
tube until the level is correct.
Type A
Type B
If an overfill occurs, excess fluid should be removed by a qualified
technician.
Note: An overfill condition of transmission fluid may cause shift and/or
engagement concerns and/or possible damage.
Do not use supplemental transmission fluid additives, treatments or
cleaning agents. The use of these materials may affect transmission
operation and result in damage to internal transmission components.
Maintenance 309
2013 F-250/350/450/550 (f23)
Owners Guide gf, 1st Printing
USA (fus)