Hello, I'm Chris. Thanks for seeking us for help.
Yes you are correct the repair does consist of a upgraded valve body installation to address the harsh 1-2 shift as long as it just harsh and not delayed.
While I thank you for your reply. I am not happy with your answer. Anybody could have told me what you did. More information would be much more helpful. A simple confirmation of my diagnosis is not satisfactory. I would like to know if this is unique to the model year, how common this is, is an aftermarket valve body superior to an OEM one from the dealer and possibly a reason for the hard shifting. No note of resetting the adaptive learning system by removing the two transmission fuses was mentioned either. I have found that this simple action can save the replacement of the valve body. I cannot endorse this site.
Here is my copied response from Nov 14.
No this is not unique to this model, it effects many years and models with this transmission.
An OEM valve body is better than aftermarket.
A reset or adaptive shift strategy relearning is a short lived patch, that will not last.