Chevrolet 1995 Astro Cargo Owner's Manual page 73

Ensure the shift lever is fully in PARK (P) range before starting the engine.
Your vehicle has a brake-transmission shift interlock. You have to fully
apply your regular brakes before you can shift from PARK
(P)
when the
ignition key is in the RUN position. If you cannot shift out of PARK (P),
ease pressure on the shift lever
-
push the shift lever all the way into
PARK (P) as you maintain brake application. Then move the shift lever into
the gear you wish. See "Shifting Out of PARK (P)" in this section.
REVERSE (R)
-
Use this gear to back up.
NOTICE:
Shifting to REVERSE (R) while your vehicle is moving forward
could damage your transmission. Shift to REVERSE (R) only
after your vehicle is stopped.
To rock your vehicle back and forth to get out of snow, ice or sand
without damaging your transmission, see "If You're Stuck: In Sand,
Mud, Ice or Snow'' in the Index.
NEUTRAL (N)
-
In this position, your engine doesn't connect with
the wheels. To restart when you're already moving, use NEUTRAL (N)
only. Also, use NEUTRAL (N) when your vehicle is being towed.
A
CAUTION:
Shifting out of PARK (P) or NEUTRAL (N) while your engine is
"racing" (running at high speed) is dangerous. Unless your foot
is firmly on the brake pedal, your vehicle could move very
rapidly. You could lose control and hit people or objects. Don't
shift out of PARK (P) or NEUTRAL (N) while your engine is
racing.
NOTICE:
Damage to your transmission caused by shifting out of PARK
(P) or NEUTRAL (N) with the engine racing isn't covered by
your warranty.
2- 19