GM Chevrolet Avalanche - Manual (Page 386)

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 1/2 inch (12 mm) to about
5/8 inch (18 mm) below the filler plug hole for
the 1500 series, and from 1/4 inch (6 mm) to about
3/8 inch (10 mm) below the filler plug hole for
2500 series.
• When the differential is at operating temperature
(warm), 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 on page 6-13.
Bulb Replacement
For the proper type of replacement bulbs, see
Replacement Bulbs on page 5-60.
For any bulb changing procedure not listed in this
section, contact your dealer.
Halogen Bulbs
{ CAUTION:
Halogen bulbs have pressurized gas inside and
can burst if you drop or scratch the bulb. You or
others could be injured. Be sure to read and
follow the instructions on the bulb package.
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