https://www.youtube.com/watch?v=KhPB7-RWQbY&t=12s
GM 6L80 Transmission Tuning Tips | HP Tuners
Type: Posts; User: MAF-tuning
https://www.youtube.com/watch?v=KhPB7-RWQbY&t=12s
GM 6L80 Transmission Tuning Tips | HP Tuners
will not fix this for you,
and will require an upgrade to mpvi3 for $399.