I'm about ready to try some transmission tuning.

The main patient is using a '7060 and a 4L80E, but another patient is using a '7427, and a 4L60E.

Looking at the $85 XDF there are two tables for shift, "Normal Mode Upshift/Downshift Vs. MPH Vs. TPS" and "Performance Mode Upshift/Downshift Vs. MPH Vs. TPS." I would suspect these two tables are what is the main control for when the tranny shifts, based on TPS, but the numbers in th etable are not defined as something that I can relate to. When I first looked at them I though that a higher number would mean delayed or higher RPM shift, but then looking deeper into the tables, the performance mode table has some lower numbers than the normal mode table.

I'm going to try and find some information I vaguely recall seeing a few years ago, but in the mean time, anything you have, lets get it in this thread. :D