FORD 2012 F-550 v.2 - Manual (Page 401)

Correct fluid level
For vehicles equipped with 5-speed transmissions, the fluid should be
checked at normal operating temperature 150°F-170°F (66°C-77°C) on a
level surface. For vehicles equipped with 6-speed transmissions, the fluid
should be checked at normal operating temperature 180°F-200°F
(82°C-93°C) on a level surface. The normal operating temperature can
be reached after approximately 20 miles (30 km) of driving.
Type A
Type B
For vehicles equipped with 5-speed transmissions, the transmission fluid
should be in this range if at normal operating temperature (150°F-170°F
[66°C-77°C]). For vehicles equipped with 6-speed transmissions, the
transmission fluid should be in this range if at normal operating
temperature (180°F-200°F [82°C-93°C]).
High fluid level
Type A
Type B
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.
ADD COLD HOT DO NOT ADD
ADD COLD HOT DO NOT ADD
Maintenance and Specifications
401
2012 F-250/350/450/550 (f23)
Owners Guide, 2nd Printing
USA (fus)