04-05 MC SS were the super 3.8, the 06-07 MC SS were the 5.3 LS4 w/303HP and ~320 lb/ft.

unfortunately, the LS4 cars tend to tear through 4T65E-HD transmissions. if i were to ever acquire one, step #1 would be dropping out the 4T65 and installing 4T80. why GM chose to use a 4T65 in an application that generated more torque than the highest output 4T80 application, i'll never know.