I have a 2005 GTO LS2 with a 4l65E that is built. I believe it has a shift kit, corvette solenoid valve, upgraded drum. I'm pretty much stock so figure 400 ft pounds of torque. The car shifts really really hard 1-2, then 2-3 starts to shift and then doesn't go in and it revs up. If I let off, it shifts, but seems like the convertor is locked then and it is slow to accelerate. It jumped out of gear in the burnout box, during the burnout, once as well. Another symptom is after I have been beating on it, when I go to shut it off there is a tire chirp like sound from the transmission.
I'm wondering if someone could take a look at my tune and tell me if something in there could be causing it. Before I had the trans built, I halved the shift times and turned the pressures all the way up. Is it possible the mechanical shift kit plus the software is causing the issues?
Any help much appreciated. Stock GTO A4 tune attached for comparison and my SD tune.