GMC SIERRA 2002 Manual page 469

Scheduled Maintenance
50,000 Miles (83 000 km)
j
Change automatic transmission fluid and filter if the vehicle's GVWR is over
8600 lbs., if the vehicle has an Allison transmission 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.
– Uses such as found in taxi, police or delivery service.
Except Allison Transmission: If you do not use your vehicle under any of these
conditions, change the fluid and filter at 100,000 miles (166 000 km).
j Automatic Transfer Case Only: Change transfer case fluid.
52,500 Miles (87 500 km)
j Check rear/front axle fluid level and add fluid as needed. Check constant
velocity joints and axle seals for leaking.
j Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
rotation pattern and additional information. (See footnote +.)
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