GMC 2001 Sierra 1500 Pickup Owner's Manual page 437

Scheduled Maintenance -- Gasoline Engines
50,000 Miles (83 000 km)
j
Except Allison Transmission: 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.
– 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 Allison Transmission Only: If you haven't used your vehicle under severe
conditions listed previously and, therefore, haven't changed your automatic
transmission fluid, change both the fluid and filter.
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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