Werid jerking sound when transmission from 3 to 4
My name is Andy, from Hong Kong, my car is 2006 E91, it is import used car. No matter I am using D, DS or M+/- , when shifting from 3 to 4, there is a werid jerking sound, and I feel the car is a bit pull and then go, and all other shifting are very smooth, no problem, is there any possible problem ? Thanks !!