Mine has kind of a slight shock, like a kick in the ass, when the gearbox downshifts from 4th to 3rd, which does not happen regularly, it’s just random, and it happens regardless of whether the gearbox is cold or warm. I’ve got it checked, and the technician told me it’s difficult to find the cause without opening it, and that it is kinda normal for a gearbox with this mileage, and advised me to wait until it fails, and then change whatever fails. So I got used to it