I have an automatic. When I approach a freeway and prepare to merge, i keep it in 2 and taxi like an airplane. I then gun it and when I reach my desired speed, I put it into 3. It shifts reallllly hard, almost like slamming into gear and the car jolts. Is this bad for the car? The reason I do this is because the car is in a higher gear than I would like and it takes forever to downshift when I kick it. Thanks.