Transfer Case
Inspect the transfer case for fluid leaks. If a fluid leak is
evident the transfer case fluid level can be checked by
removing the filler plug located on the back side of the
transfer case. The fluid level should be at the bottom edge
of the filler plug hole when the vehicle is in a level
position.
The transfer case fluid should be drained and refilled at
the intervals specified.
Lubricant Selection
Refer to Recommended Fluids, Lubricants and Genuine
Parts for correct fluid type.
Axles
Refer to Recommended Fluids, Lubricants and Genuine
Parts for correct fluid type.
The manufacturer does not recommend regularly sched-
uled oil changes for axles in vehicles whose operation is
classified as normal truck service.
NOTE:
The presence of water in the gear lubricant will
result in corrosion and possible failure of differential
components. Operation of the vehicle in water, as may be
encountered in some off-highway types of service, will
require draining and refilling the axle to avoid damage.
Rear Axle
Limited-slip differentials require the use of Mopart lim-
ited slip additive. Refer to Recommended Fluids, Lubri-
cants and Genuine Parts for correct fluid type. This
should be added to the gear lubricant whenever a fluid
change is made, when equipped with a limited-slip
differential. Rear axle fluid level should be 1/49 (6.35
mm) below filler plug hole for 8 1/4 axles and should be
5/89 (16 mm) below filler plug hole for 9 1/49 axles.
Front Axle
Front axle fluid level should be at the bottom of the filler
plug hole.
Selection of Lubricating Grease
The National Lubricating Grease Institute (NLGI) has
developed a symbol (Certification Mark) to aid the
vehicle owner in the proper selection of grease for chassis
components. This symbol, an example shown below, is
located on the grease container and identifies the appli-
cation and quality of the grease.
248 MAINTAINING YOUR VEHICLE
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