Here is the
part from my post on my 4.8is tranny fluid flush that pertains to this thread
Quote:
PART 2! The Lurch!
After a week my car started shifting down from 2-1 with a lurch or a feeling like I was getting rear ended whenever I came to a stop. Very harsh. Upshifts were harsh too. 
My 2 cents is that the transmission didn't "know" it had new fluid and was operating on settings it "learned" or adapted to.
Took to my mechanic who reset the "Adaptations" in the transmission and then updated the software to the latest for the ZF. It was the best $180 I've spent! It shifts better now than before I even did the fluid change! Do these two things first if you have issues after flushing your fluid or with the "lurch" or harsh shifting in general.
Happy motoring! Hope this was helpful.
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