disreguarding the fact that your "not suppose to" so that fast when an 08 impala ss rolls up on the highway most people are going to run it. but back to the issue, so the tcc isnt going to change the power output if its unlocked or locked up during hard acceleration? im not a trans. person by any means but in theory with the motor being bored over, it should make more power considering the supercharger works off displacement, and it pulls the same through 1st and 2nd it leaves the trans. as the most likely cause, so the question i guess is the tcc lockup shouldnt affect acceleration wether its locked or not