a hidden parameter that control this behavior in the factory calibration? the trans shift perfectly on the street, and according to another thread we had going on with the same issue, as long as the trans can do the 3-4 shift before a WOT run, everything is good: http://www.hptuners.com/forum/showth...ight=3-4+shift
Please help, this seems to affect G8GT's in general, and no matter what you do, after an engine restart, if you go WOT inmediatly, the 3-4 shift will hang, then complete. it affects Normal and Sport mode, haven't try Manual mode since i let the TCM handles the shifts. once the car has completed a 3-4 shift, then the 3-4 WOT shift works as expected, the shift is crisp and quick as it's supposed to.
Regards,