GMC 2001 Sierra 1500 Pickup Owner's Manual page 442

Scheduled Maintenance -- Gasoline Engines
150,000 Miles (240 000 km)
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Drain, flush and refill cooling system (or every 60 months since last service,
whichever occurs first). See "Engine Coolant" in the Index for what to use.
Inspect hoses. Clean radiator, condenser, pressure cap and neck. Pressure test
the cooling system and pressure cap.
An Emission Control Service.
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Change five speed manual transmission fluid
(with 4300 V6 or 4800 V8 engines only).
200,000 Miles (332 000 km)
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6000 V8 Engine Only: Change five
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speed manual transmission fluid.
DATE
ACTUAL
SERVICED BY:
MILEAGE
DATE
ACTUAL
SERVICED BY:
MILEAGE
7-17