GMC 2001 Sierra 1500 Pickup Owner's Manual page 435

Scheduled Maintenance -- Gasoline Engines
22,500 Miles (37 500 km)
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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 +.)
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).
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