I have a 2002 duramax with the allsion. 195k most everything has been gone through to add reliability and power to pull the hills and passes from Denver west. I currently have 50hp injectors from ATS, Airaid intake, banks six gun, banks monster single exhaust, banks big head waste gate, superchips flashpaq, FASS lift pump. I recently had it dyno'd and it only came to about 370 at the rear wheel with all chips at max, I know the transmission takes a lot, but not that much. Does anyone have any idea what I need to look into to find why my power gets lost somewhere? The transmission doesn't seem to slip and we have never had a limp home problem before. We have always done trans services every year and no excess metal and no out the ordinary wear on anything. I need help, I paid for all this power and want to find it.