Ford Super Duty Owner's Manual page 311

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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, 1st Printing

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.