Can?t figure out how to load files to share but go to this link and you can download an excel workbook that will help show where 3-4,4-3 shift points occur and lockup/unlock points occur, adjusts automatically for tire size and axle ratio you enter, play with tables and see how it affects things. Haven?t got gov pressure and tva position figured out yet but as soon as I do those will be added in.
https://smartysupport.com/files/downloads/file/40-48re-tuning-workbook/