Ford Super Duty Owner's Manual page 317

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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.

TRANSFER CASE FLUID CHECK (IF EQUIPPED)

Use only fluid that meets Ford specifications. Refer to the Capacities

and Specifications section .

2013 F-250/350/450/550 (f23)

Owners Guide gf, 3rd Printing, December 2012

1. Clean the filler plug.

2. Remove the filler plug and

inspect the fluid level.

3. Add only enough fluid

through the filler opening so

that the fluid level is at the

bottom of the opening.