'05 auto trans clunking

I am not sure if this a major issue or not. When I leave a red light or stop sign, I feel a definite clunk in the transmission upon acceleration. Likewise when I am stopping at a light, etc. Just before completely stopping I can feel it. It seems to surge in drive after backing up as well. It shifts fine other than that. I took it in to the dealer and they road tested it and replaced the shift computer. I picked it up and it seems a little better but is definitely still there. I am thinking the dealer doesn't really know. Any help would be greatly appreciated.

 

take it back to the dealer and get them to check the tranny fluid.........it may be a bit low. the 06 i had was low from the factory and it would do this, as well as shift late sometimes. it was low a quart from the factory. hope this helps!