I have an 02 Bonneville with a 3800 NA and the motor is shot. I found a 3800 SC motor and i was wondering what i all had to swap besides the minor stuff like brakets. Do i have to change the PCM or do anything with the harness let me know. Thanks.

You would either have to swap in an SSEi PCM or program yours. It'* also a good idea to beef up your transmission unless the motor you're looking at getting comes with an HD trans.