[KirkEvil]

I installed a transgo hd2 reprogramming kit on my 4l60e before a tune with the full 3 washers in the accumulator. The 1-2 shift was very hard and the 2-3 shift was semi-firm because the torque management was still active. Once the torque management was tuned out the both the 1-2 and 2-3 was much harder.

You DO NOT want to bump line pressure through tuning if you have a shift kit; it will put too much pressure on the trans. Also, you dont want the 3-4 shift to be super firm since that is the torque converter going into lockup, and you dont want to burn out the lockup clutch. Plus your car should not be shifting into 4th if you are accelerating hard.