ikaros23

after long trips in the highway and getting into the city my car does some weird ratlle thing and it seems it comes from the rear, not shure of it. I was waiting for the light to go green, then I start and when the tranny(auto) shifts from first to second it did BUM and the car shakes a little, then when it comes 3 gear it does the same thing but at a slower pace. the problem seems to happen when the car is stop and then you star driving. the harder you pull it the worst so I stop running like a mad man around and I'm driving like a gentleman. help anyone