I was able to change my "Desired Shift Time for Base Up-shifts" in my 2007 Sierra Denali (6L80). That section is not available in my 2010 Sierra SLT (6L80). There are a bunch of new fields and some that relate to shift times but not so cut and dry. I attached my tune any advice on how to you would shorten shift times a based on my .hpt file?
Thanks,
Mark