Filter
Top Products
• For 6.0L engines, the proper level is from
0.6 inch to 1.6 inches (15 mm to 40 mm) below
the bottom of the filler plug hole, located on the
rear axle. Add only enough fluid to reach the
proper level.
• The proper fill level for the 2500 Series is from
0 to 1/2 inch (0 to 13 mm) below the bottom of
the filler plug hole, located at the front of the
axle. Add only enough fluid to reach the
proper level.
Four-Wheel Drive
Lubricant checks in this section also apply to
these vehicles. There are two additional systems
that need lubrication.
Transfer Case
When to Check Lubricant
It is not necessary to regularly check transfer case
fluid unless you suspect there is a leak, or you
hear an unusual noise. A fluid loss could indicate
a problem. Have it inspected and repaired.
How to Check Lubricant
To get an accurate reading, the vehicle should be
on a level surface.
If the level is below the bottom of the filler plug hole,
you will need to add some lubricant. Add enough
lubricant to raise the level to the bottom of the filler
plug hole. Use care not to overtighten the plug.
When to Change Lubricant
Refer to the Maintenance Schedule to determine
how often to change the lubricant. See Scheduled
Maintenance on page 579.
Automatic Transfer Case
497