I had my tranny replaced maybe about a month and a half ago by the dealership...they changed everything...under warranty...i got a 2004 Z..my car runs smooth but for some reason when i try to acceralate fast, when i shift from 2nd to 3rd at maybe 6k rpm..it sometimes grinds, this has happened couple of times. is it me not shoving the gear into 3rd fully or is it a common tranny problem because it happens sometimes, not all the time. any opinions

i feel like i am shifting right, so thats why i ask