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?

 

this would be better in the truck section

I have the same problem same shift kit and all Ive tried tuning around it and its not gonna happen. Best remedy I can come up with is to leave the positive shift motor current stock to about 72 and drop it from there, then back off the throttle to less than 20 tps and it smooths the shift out. 30 to about 50 tps is the bad area where it just jars the hell out of ya. I wouldnt raise the shift motor voltages over stock with that kit youll eat up shift silenoids. Also put some of the TM back in on the tranny side
hope that helps