Tranny swap

[Beast123]

I have a 08 Silverado vortex max 6.0 4x4 ltz with a 4l70e. My tranny took a crap again this is the 2nd one stage 2. I recently twin turboed the truck dropped off at tuner and transmission went out on dyno. Can't handle the HP. I pulled the transmission today and plan on putting in a 4l80e. My truck came with everything that the HD trucks came with except the 4l80e. I need to get a cross member that will be a direct bolt on. I have a big drive line already. Any ides or is there any one who has done this already