I'm not quite sure what it does. I saw an 08 corvette cal that said 5L40e and the trans was a 6L80e.

I just finished a car that had an 2014 LS3 engine and ecm but an '08 15 pin 4L60e and t42. When I first started on the project the ecm said it had a 6L80e and the trans program was doing all kinds of weirdness. I threw away both programs, started from scratch, set the ecm for 4L60e and all worked out fine in the end so I don't know if the setting helped or if the trans cal was that jacked up.