Quote Originally Posted by joecar View Post
Measure line pressure at the tap on the side of the case, see what it does during the shift.

Also log GM.TFMPRS, GM.GEAR and the other pids (VSS, RPM, ETC or ETCTP, MAP, MAF, ECT, TFT, TCCMODE) and post here.
Had to get new laptop, lost all my files and some reason couldn't get efi live to work but all good now I think.
Just need to locate a pressure gauge.
If i had to guess its not commanding the shift all the time. went to the track and 1 pass shifted okay 10.89 @ 128 but 2nd pass wouldn't shift into 3rd and pulled 2nd all the way to redline 100 mph at the 1000ft and just bounced rev limiter. I lift and put in D and it shifts.