GMC 1996 Sierra Owner's Manual page 360

Long Tripmighway Maintenance Schedule
--
Gasoline Engines
I
45,000 Miles (75 000 km) (Continued)
0
If your engine has a thermostatically
controlled cooling fan, inspect all hoses
and ducts for proper hook-up (or every
12 months, whichever occurs first). Be sure
the valve works properly.
This is a Noise
Emission Control Service. Applicable only to
vehicles sold in the United States.
DATE ACTUAL MILEAGE
SERVICED B Y
I
50,000 Miles (83 000 km)
0
Change automatic transmission fluid
and filter if the vehicle's GVWR is over
8600 lbs. or if the vehicle is mainly driven
under one or more of these conditions:
-
In heavy city traffic where the outside
temperature regularly reaches 90" F
(32°C) or higher.
-
In hilly or mountainous terrain.
- When doing frequent trailer towing.
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