This all started with me rebuilding a 6l80 once a week due to torque converter clutch failure. I have disabled AFM getting rid of the 40RPM ECCC slip. also have lockup in 4-5-6, 3rd at very light throttle. also have taken the 20rpm slip out at higher torque zones. 2 questions:
1: I occasionally get a "fishbite" when the torque converter is trying to reach 0 slip. 0-12 rpm slip is seen when this happens. From my understanding the software tries to figure out exactly how much pressure it takes to hold 0 rpm slip which in my opinion causing this "fishbite" feeling and causes torque converter clutch flaking.
2: I cannot figure out how to control the shift firmness. the stock tune has the 1-2 shift very soft and delayed as to give the converter a chance to lock as soon as it hits 2nd. I cannot get the 1-2 shift correct. also the 2-3 shift is a little off causing a very slight "clack" at light throttle upshift.
Again, my truck is completely stock. I am only trying to make the converter last longer that 90K miles and of course drivability. locking the converter in 2nd(stock tune) causing poor acceleration and will also burn the converter clutch at mid throttle. Lastly I disabled WOT lockup.