Ford 2006 F-250 Owner's Manual page 283

Maintenance and Specifications
CHECKING AND ADDING TRANSFER CASE FLUID (IF EQUIPPED)
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.
Use only fluid that meets Ford specifications. Refer to Lubricant
specifications in this chapter.
DRIVELINE UNIVERSAL JOINT AND SLIP YOKE
If the original universal joints are replaced with universal joints equipped
with grease fittings, lubrication will be necessary. Refer to the scheduled
maintenance information for maintenance intervals.
AIR FILTER MAINTENANCE
Refer to the scheduled maintenance information for the appropriate
intervals for changing the air filter element.
When changing the air filter element, use only the Motorcraft air filter
element listed. Refer to Motorcraft part numbers in this chapter.
283
2006 F-250/350/450/550 (f23)
Owners Guide (post-2002-fmt)
USA (fus)