GMC 2001 Safari Owner's Manual page 274

Checking the Fluid Level
Prepare your vehicle as follows:
D
Park your vehicle on a level place. Keep the
engine running.
D
With the parking brake applied, place the shift lever
in PARK (P).
D
With your foot on the brake pedal, move the shift
lever through each gear range, pausing for about
three seconds in each range. Then, position the shift
lever in PARK (P).
D
Let the engine run at idle for three minutes or more.
6-22
Then, without shutting off the engine, follow
these steps:
1. The transmission dipstick has a red handle and is
located near the center of the engine compartment
behind the air cleaner. See "Engine Compartment
Overview" in the Index for more information on
location. Flip the handle up and then pull out the
dipstick and wipe it with a clean rag or paper towel.
2. Push it back in all the way, wait three seconds and
then pull it back out again.