Pontiac 1999 Firebird - Manual (Page 270)

yellow blue
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Checking the Fluid Level
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.
Then, without shutting off the engine, follow
these steps:
3800 V6 Dipstick 5.7L V8 Dipstick