tci 6 speed auto

That ain't no 4L80E. It's a 6L80E. It's a massive trans and you will be cutting for days to make it fit. I helped a friend install one in a 38 Chevy. It is programmed with a laptop. After we installed the replacement trans and the replacement computer it worked pretty cool. Never got the paddle shifter working. The Tech line was a PITA.