It is safe to say most motorists who own an automatic car doesn’t get the most out of their vehicles. To let you get the easiest example of it, we would like to talk about the gearing system. We are all used to D, N, R, and P which stand for Drive, Neutral, Reverse, and Park but do you understand the functions of D, D1, D2, D3?

Automatic gearshift

We are all used to D, N, R, and P which stand for Drive, Neutral, Reverse, and Park

Here’s the answer for you BELOW!!

http://automilas.com/2018/06/06/what-do-d1-d2-and-d3-do-in-automatic-cars/

I think I've answered this question before

Your car has no owner's manual or you didn't attend the driving school

Manual shifting

Gear 1,2,3

Gear 1 and 2 only. 3 and 4 are automatic, because they downshift to 1 and upshift to 3 or 4.

Gear 1 and 2 will not downshift or upshift. They will die there until you do it yourself. There's a box around 3 and 4 which denotes this.

Though it depends on the car. Most 4 speed have this setup.