Chevrolet Silverado 2007 Owner's Manual page 549

Manual Shift Transfer Case
A. Fill Plug
B. Drain Plug
Active Transfer Case
A. Fill Plug
B. Drain Plug
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, located on the transfer case, 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.
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