Googling and googling.. don't know where to turn
I've had this issue a lot. Earlier this morning, with my latest tune (pulled down some mph wot values for trans), I seemed to have fixed it. From a stop, floored it, and it shifted from first, to second, to third, and then I let off.
This afternoon, I touched nothing, and I couldn't get to shift out of first on wot. I'm in drive, in second gear, I punch it, it downshifts to first, and then it bounces off the rev limiter. Attached is my log (scroll to the end) and my tune.
It's a 4l80e segment swap. My mph and what not is scaled properly to trans revs per mile (i.e. my mph output reads properly)
Regular driving.. shifts great through all the gears, runs good. I can command each gear in hp tuners.. Drives great, just wot in first just won't go into second (though it randomly fully worked this morning, on one try).
fail.hplSTAGE1b - more shift corrections.hpt