Chevrolet SUBURBAN 1993 Owner's Manual page 82

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.
OD (Automatic Overdrive)
This position is for normal driving.
If you need more power for passing, and
vou're:
-
Going less than about 35 mph (56 km/h), push your accelerator
pedal about halfway down
-
Going about
35
mph (56 km/h) or more, push the accelerator
all the
way down
You'll shift down to the next gear and have more power.
OD 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 OD, but you never go into Overdrive. You should use D 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
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, 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.
You can use it on very steep hills, or in deep snow or mud. If the selector
lever is put in 1, the transmission won't shift into first gear until the vehicle is
going 'slowly enough.
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