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All-Wheel Drive
If your vehicle has the LTZ package, lubricant checks in
this section also apply to this vehicle.
Transfer Case
When to Check Lubricant
Refer to the Maintenance Schedule to determine how
often to check the lubricant. See Scheduled
Maintenance on page 6-4.
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’ll 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.
What to Use
Refer to the Maintenance Schedule to determine what
kind of lubricant to use. See Recommended Fluids
and Lubricants on page 6-12.
Rear Axle
When to Check Lubricant
It is not necessary to regularly check rear axle 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.
All axle assemblies are filled by volume of fluid during
production. They are not filled to reach a certain
level. When checking the fluid level on any rear axle,
variations in the readings can be caused by factory
fill differences between the minimum and maximum fluid
volume. Also, if a vehicle has just been driven before
checking the fluid level, it may appear lower than normal
because fluid has traveled out along the axle tubes
and has not drained back to the sump area.
Suburban LTZ (A) Drain Plug (B) Filler Plug
5-47