GMC 1996 Sierra Owner's Manual page 332

Short TripKity Maintenance Schedule
--
Gasoline Engines
The services shown in this schedule up to 100,000 miles
(1
66 000 km) should be performed after 100,000 miles
(166 000 km) at the same intervals.
Footnotes
T
The U.S. Environmental Protection Agency or the
California Air Resources Board has determined that
the failure to perform this maintenance item will not
nullify the emission warranty or limit recall liability
prior to the completion of the vehicle's useful life.
We, however, urge that all recommended
maintenance services be performed at the indicated
intervals and the maintenance be recorded.
#
Lubricate the front suspension, kingpin bushings,
steering linkage, transmission shift linkage, transfer
case shift linkage, parking brake cable guides, rear
driveline center splines, front axle propshaft splines
and brake pedal springs. Ball joints and kingpin
bushings should not be lubricated unless their
temperature is 10°F
(-
12°C) or higher, or they
could be damaged.
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Drive axle service:
Locking Differential -- Drain fluid and refill at first
engine o i l change. At subsequent oil changes, check
fluid level and add fluid as needed. If driving in
dusty areas or towing a trailer, drain fluid and refill
every 15,000 miles (25 000 km).
Standard Differential -- Check fluid level and add
fluid as needed at every o i l change. If driving in
dusty areas or towing a trailer, drain fluid and refill
every I5,OOO miles (25 000 km).
More frequent lubrication may be required for
heavy-duty or off-road use.
3500 HD Models with applications requiring extreme
overload/trailer towing conditions and high-speed
(above 45 mph or 70 kmh) conditions for extended
periods of time must have the drive axle fluid changed
evey 30,000 miles (50 000 km). See "Recommended
Fluids and Lubricants'' in this section.
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