These LS4 cars even came with strengthen parts and still break. The 4T65e has all kinds of weak parts (grocery getter cars) and making it stronger to handle over 350 hp at the wheel from a 3.8 will definitely require better clutches (I'm installing the blue plate special clutches from Raybestos), input shaft, stronger oil shaft, stronger sun gear, and fix the current problems that the 4T65E suffers from like sudden launching, among other things.