Chevrolet 1994 Blazer Owner's Manual page 76

NOTICE:
Damage to your transmission caused by shifting out of "P"
(Park) or "N" (Neutral) with the engine racing isn't covered by
your warranty.
@
(Overdrive)
This position is for normal driving. If you need more power for
passing, and you're:
-
Going less than about
35
mph (56 km/h), push your accelerator
-
Going about
35 mph (56 km/h) or more, push the accelerator all
pedal about halfway down.
the way down.
You'll shift down to the next gear and have more power.
@
should not be used when towing a trailer, carrying
a
heavy
load, driving
on
steep hills, or for off-road driving. Select
"D"
(Third Gear) when operating the vehicle under any of these
conditions.
D (Third Gear)
-
This is like
@,
but you never go into Overdrive.
You should use "D' (Third Gear) when towing a trailer, carrying a
heavy load, driving on steep hills, or for off-road driving.
2 (Second Gear)
-
This position gives you more power but lower fuel
economy. You can use "2" (Second Gear) on hills. It can help control
your speed as you go down steep mountain roads, but then you would
also want to use your brakes off and on.
If you manually select "2" (Second Gear), the transmission will drive
in second gear. You may use this feature for reducing torque to the rear
wheels when you are trying to start your vehicle from a stop on
slippery road surfaces.
1 (First Gear) - This position gives you even more power (but lower
fuel economy) than "2" (Second Gear). You can use it on very steep
hills, or in deep snow or mud. If the selector lever is put in
"1"
(First
Gear), the transmission won't shift into
"1"
(First Gear) until the
vehicle is going slowly enough.
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