Transfer Case Fluid Check - Ford Super Duty Owner's Manual

316
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, 2nd Printing, December 2012
USA (fus)
Maintenance
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.