1999 Chevrolet Tahoe Owner's Manual - Page 303
1999 Chevrolet Tahoe Manual
Page 303 highlights
yellowblue How to Check Lubricant Automatic Transfer Case Manual Transfer Case 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. What to Use Refer to the Maintenance Schedule to determine what kind of lubricant to use. See "Recommended Fluids and Lubricants" in the Index. 6-23
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yellow
blue
6-23
How to Check Lubricant
Manual Transfer Case
Automatic Transfer Case
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.
What to Use
Refer to the Maintenance Schedule to determine what
kind of lubricant to use. See “Recommended Fluids and
Lubricants” in the Index.