I am looking for replieson owners with 2.7 automaticthat have adjusted tranny codes ,and what their experice has been? I have a 04 sline

More than often I feel that the car prematurely shifts from 1st to 2nd gear,causing a slow throttle response.

Also I noticed when it is in tip mode it shifts from 1st to second prematurely..is that normal??

What codes have you experienced? and how safe has it been to play with this feature?

As always,Thanks for all your replys