Chevrolet LUMINA 1999, Owner'S Manual

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DRIVE (D): This position is also used for normal
driving, but it offers more power and lower fuel
economy than AUTOMATIC OVERDRIVE (
B).
Here are some times you might choose DRIVE (D)
instead of AUTOMATIC OVERDRIVE (
B):
D When driving on hilly, winding roads.
D When towing a trailer, so there is less shifting
between gears.
D When going down a steep hill.
SECOND (2): This position gives you more power but
lower fuel economy. You can use SECOND (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.
NOTICE:
Don’t drive in SECOND (2) for more than
25 miles (40 km) at speeds over 55 mph
(88 km/h), or you can damage your transaxle.
Use DRIVE (D) or AUTOMATIC
OVERDRIVE (
B) as much as possible.
Don’t shift into SECOND (2) unless you are going
slower than 65 mph (105 km/h), or you can
damage your engine.