[KingLT1]

I believe some of the issue is the converter unlocking. When I tuned my trans to not lock the converter until 8th gear part throttle the issue went away. This is how they should of came from the factory being it's easier on the converter and much smoother driving. The downside is it lowers fuel mileage...and is the only reason why GM programs the converter to lock up in the lower gears. Sometimes the converter will hang on too long while locked and jerk when you slow down or round a corner. I also believe some of it is related to what Jax Chris mentioned, but I do know changing how the converter locks seems to have eliminated the issue for me.