am having a problem with the 1-2 shift in my 4l60e equipped truck.
This is 2004 Silverado 5.3 with bolt ons only.
I had originally tuned for a bit more LP, no TQM, faster shift speeds, etc..
After installing a Transgo, the 1-2 shift became unbearable.
I returned all the settings to stock, except TQM, and all was well.
Until the next day, when the shifts became harsh again.
I have reflashed several times for other things, and each time the shifts are great for a day or 2, and then back to being too harsh.
And suggestions or questions?