Here are some times you might choose THIRD (3) instead of AUTOMATIC OVERDRIVE (D):

When driving on hilly, winding roads

When towing a trailer, so there is less shifting between gears

When going down a steep hill

SECOND (2): This position gives you more power but lower fuel economy than THIRD (3). 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: Driving in SECOND (2) for more than

25 miles (40 km) or at speeds over 55 mph (90 km/h) may damage the transaxle. Also, shifting into SECOND (2) at speeds above 65 mph (105 km/h) can cause damage. Drive in THIRD (3) or AUTOMATIC OVERDRIVE (D) instead of SECOND (2).

Notice: If your vehicle seems to start up rather slowly, or if it seems not to shift gears as you go faster, something may be wrong with a transaxle system sensor. If you drive very far that way, your vehicle can be damaged. So, if this happens, have your vehicle serviced right away. Until then, you can use SECOND (2) when you are driving less than

35 mph (55 km/h) and THIRD (3) for higher speeds.

FIRST (1): This position gives you even more power but lower fuel economy than SECOND (2). You can use it on very steep hills, or in deep snow or mud. If the

shift lever is put in FIRST (1), the transaxle will not downshift into first gear until the vehicle is going slow enough.

Notice: Spinning the tires or holding the vehicle in one place on a hill using only the accelerator pedal may damage the transaxle. If you are stuck, do not spin the tires. When stopping on a hill,

use the brakes, or parking brake to hold the vehicle in place.

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Buick 2006 manual