Chevrolet 2008 Tahoe, Owner'S Manual, Page: 418 / 542

How to Check Lubricant
To get an accurate reading, the vehicle should be on a
level surface.
A: Fill Plug
B: Drain Plug
A: Fill Plug
B: Drain Plug
If the level is below the bottom of the filler plug hole,
located on the front axle, you may need to add some
lubricant:
•
When the differential is cold, add enough lubricant to
raise the level from 0 (0 mm) to 1/8 inch (3.2 mm)
below the filler plug hole.
•
When the differential is at operating temperature
(warm), add enough lubricant to raise the level to the
bottom of the filler plug hole.
1500 Series
2500 Series
5-54