When does one use the gear 1 and 2 in an auto-transmission car?

Answer

First gear is selected when you want to use the engine's compression as a brake while descending hills. The compression of the engine will "hold back" the vehicle so you don't have to use your brakes to the extent that you might burn them out. Used especially when towing a heavy load.

Second gear is used the same way, but for less of a downhill. It is used primarily for starting out on ice or snow or any other slippery surface. Not all the engine's power is transmitted to the drive wheels when starting out in second gear. Thus the "sliipage" of the transmission will allow you to start out without losing traction.

Answer

It is best to use 1 and 2 for hills, but if you have an auto and you want to go through the gears faster then in overdrive, put the car in first and click up from there when the car is ready to shift. Assuming that you are stoped.

Answer

Only when you are stuck in the mud.

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