Hi
This is a very long issu I have over few years and I was never able to fix it,
Up to now, tried 3 differant Builded transmission, 2 TCM, rebuilded Torque converter Try to remote tune over 50 TCM tune
from a good Nag 1 tuner and still have the exact same issu.
Tried also a Hemi tuner custom TCM with 3 different flash without succes.
Car is a Magnum SRT8 with a 406Ci Forged Motor with a V-7 Vortec blower at 18 psi, Good 1000 Hp at Motor.
motor tune is solid, no problem there, Transmissionis alwais flaring at 3-4 shift only.
Last winter, instaled another SHR war viking max, all rebuilded to eliminate transmission issue,
Behave perfectlky in the street, Very firm shift at part throttle, then hit the strip to try it safely at WOT,
No change at all, Shift firm 1-2, 2-3, at the commanded RPM but alwais short shift around 5500, 6000, then flare to 6600, then shift.
I am now sure it is not a transmission problem, it seams that the TCM tune is good, Is there somthing in the ECM tune that can cause this behaviour ?
attached TCM and PCM tune
and logdom_tune +tcm109.hpt