Chevrolet 2002 Silverado 1500 Pickup Owner's Manual page 465

Scheduled Maintenance
25,000 Miles (41 500 km)
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Allison Transmission Only: Change automatic transmission fluid and filters 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.
– Uses such as found in taxi, police or delivery service.
If you do not use your vehicle under any of these conditions, change the fluid
and filter every 50,000 miles (83 000 km).
30,000 Miles (50 000 km)
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If Equipped: Replace passenger compartment air filter. If you drive regularly
under dusty conditions, the filter may require replacement more often.
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Check rear/front axle fluid level and add fluid as needed. Check constant
velocity joints and axle seals for leaking.
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Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
rotation pattern and additional information. (See footnote +.)
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Replace fuel filter.
An Emission Control Service. (See footnote
7-10
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