I have an Infiniti M35 RWD with an automatic 5-speed transmission that I enjoy driving in manual mode. I notice that sometimes when I am accelerating hard, like going onto the highway, I can get a hard knock from the rear of the vehicle when shifting from 2nd and 3rd, when especially hard, dynamics may indicate a skid has occurred (though I don’t feel it). I have never noticed this one way or another without dynamics since it’s always on unless I get stuck in the snow or something.
I am pretty sure this is something I’m doing to cause this, and not a fault of the transmission, and it happens less now than when I was first driving it in manual, I feel that I’m doing something to prevent it, but I am not sure what exactly.
Why does this happen, and what do I need to be aware of to deliberately prevent this from happening? I can’t really imagine it’s good for the car.